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Toxoplasma gondii & Human Phenotype

Compendium of Known Effects and Ongoing Research

antibodies

The role of latent toxoplasmosis in the aetiopathogenesis of schizophrenia–the risk factor or an indication of a contact with cat?

February 6, 2020
Yuksel, P., Alpay, N., Babur, C., Bayar, R., Saribas, S., Karakose, A. R., Aksoy, C., Aslan, M., Mehmetali, S., Kilic, S., Balcioglu, I., Hamanca, O., Dirican, A., Kucukbasmaci, O., Oner, A., Torun, M. M., Kocazeybek, B.
Folia Parasitol (Praha) 2010, 57: 121 - 128 Adult Aged Animals Antibodies, Protozoan/blood Case-Control Studies Cats Cross-Sectional Studies Female Humans Immunoglobulin G/blood Male Middle Aged Retrospective Studies Risk Factors Schizophrenia/*blood/*etiology Toxoplasmosis/blood/*complications/immunology
Click for abstract
We assessed IgG antibody to Toxoplasma gondii in 300 inpatients with schizophrenia (SG), 150 outpatients with anxiety and depressive disorders (PCG), and 150 healthy blood donors (HCG). Seropositivity rates were 60.7% for SG, 36.7% for PCG, and 45.3% for HCG (p<0.001). The seropositivity rate for anti-Toxoplasma IgG antibodies in SG was significantly higher that in PCG (chi2 = 23.11, OR = 2.66, p = 0.001) and HCG (chi2 = 9.52, OR = 1.86, p = 0.002). Among SG, 85% of those who reported close cat contact had IgG antibodies to T. gondii. Close cat contacts were reported by 59% of SG, 6% of PCG, and 9% of HCG (p<0.001). There was a nonsignificant positive association between toxoplasmosis and schizophrenia for people with a contact with a cat (OR = 2.221, p = 0.127, CI95 = 0.796-6.192), and significant negative association between toxoplasmosis and schizophrenia for people without contact with a cat (OR = 0.532, p = 0.009, CI95 = 0.332-0.854). Close cat contact (OR = 2.679, p<0.001), 51-65-year age group (OR = 1.703, p<0.001) and education [illiterate+primary (OR = 6.146, p<0.001) and high school (OR = 1.974, p = 0.023)] were detected as independent risk factors in multivariate logistic regression. The effect of toxoplasmosis on risk of schizophrenia disappeared in the complex model analyzed with multivariate logistic regression. In conclusion, our data suggest that the toxoplasmosis has no direct effect on the risk of schizophrenia in Turkey but is just an indication of previous contacts with a ca

Tagged: adult, age, animals, antibodies, case-control studies, cats, cross-sectional studies, female, humans, immunoglobulin, male, middle aged, protozoan/*blood, retrospective study, Schizophrenia, Toxoplasmosis/blood/*complications/immunology

Mental health

Seroprevalence of Toxoplasma gondii infection in cancer patients: A systematic review and meta-analysis

February 4, 2020
Anvari, D., Sharif, M., Sarvi, S., Aghayan, S. A., Gholami, S., Pagheh, A. S., Hosseini, S. A., Saberi, R., Chegeni, T. N., Hosseininejad, Z., Daryani, A.
Microbial Pathogenesis 2019, 129: 30 - 42
Click for abstract
Toxoplasmosis, caused by Toxoplasma gondii, is a great public health concern in cancer patients, which can induce serious pathological effects. This systematic review and meta-analysis was performed to evaluate the worldwide seroprevalence rate of T. gondii infection among cancer patients. A search was conducted on five electronic databases that reported data on T. gondii seroprevalence in cancer patients. The searching process resulted in the inclusion of 57 studies. The results showed that T. gondii had the pooled prevalence of 30.8% in cancer patients using a random-effect model (95% CI: 26.3-35.6). Cancer patients had a higher overall prevalence of T. gondii infection, compared to those without cancer. Furthermore, the odds ratio of toxoplasmosis in cancer patients was 3.1 times, compared to that of controls (95% CI: 2.5-3.8, P < 0.0001). Toxoplasmosis had a higher prevalence in females (40%) than in males (33%). Furthermore, the age group of upper 40 years had the highest prevalence infection rate (30%). In addition, a significant association was also observed between toxoplasmosis infection and year (P < 0.001), type of cancer (P < 0.001), country (P < 0.001), gender (P < 0.001), age (P = 0.006) and diagnostic method (P < 0.001) in cancer patients. Considering the high prevalence of T. gondii infection in cancer patients and its serious outcomes, the researchers are suggested to carry out further studies to prevent and control toxoplasmosis among this population.

Tagged: antibodies, b1 gene, brain, childern, cncer patients, epidemiologymalignancies, healthy, individuals, liver-disease, meta-analysis, systematic review, Toxoplasma gondii, toxoplasmosis

Reviews

Sero-epidemiological status and risk factors of toxoplasmosis in pregnant women in Northern Vietnam

February 1, 2020
Smit, G. S. A., Vu, B. T. L., Do, D. T., Do, Q. H., Pham, H. Q., Speybroeck, N., Devleesschauwer, B., Padalko, E., Roets, E., Dorny, P.
BMC Infectious Diseases 2019, 19 Toxoplasmosis during pregnancy Congenital toxoplasmosis Seroprevalence Risk factors Prevention Vietnam congenital toxoplasmosis gondii seroprevalence antibodies infection events burden igm
Click for abstract
BackgroundIn Vietnam, few studies have determined the epidemiological status of toxoplasmosis in pregnant women and no routine prenatal screening is in place. This study was conducted to evaluate the seroprevalence of this zoonotic parasitic infection in pregnant women in Northern Vietnam and to assess the association with awareness, risk factors and congenital toxoplasmosis.MethodsApproximately 800 pregnant women were included in the study from two hospitals, one in Hanoi and one in Thai Binh province, which is known to have a dense cat population. Serological immunoglobulin G (IgG) and immunoglobulin M (IgM) detection was performed to estimate the seroprevalence of toxoplasmosis and sero-incidence of maternal and congenital toxoplasmosis. In addition, a survey was conducted about awareness, clinical history, presentation of signs and symptoms relating to toxoplasmosis and to detect biologically plausible and socio-demographic risk factors associated with toxoplasmosis. Associations with seroprevalence were assessed using univariable and multivariable analysis.ResultsThe mean IgG seroprevalence after the full diagnostic process was 4.5% (95% confidence interval(CI): 2.7-7.0) and 5.8% (95% CI: 3.7-8.6) in Hanoi and Thai Binh hospital, respectively, and included one seroconversion diagnosed in Thai Binh hospital. Only 2.0% of the pregnant women in Hanoi hospital and 3.3% in Thai Binh hospital had heard about toxoplasmosis before this study.ConclusionSince the percentage of seronegative, and thus susceptible, pregnant women was high and the awareness was low, we suggest to distribute information about toxoplasmosis and its prevention among women of child bearing age. Furthermore, future studies are recommended to investigate why such a low seroprevalence was seen in pregnant women in Northern Vietnam compared to other countries in South East Asia and globally.

Tagged: antibodies, congenital toxoplasmosis, prevention, risk factors, seroprevalence

Reproduction

Relationship between toxoplasmosis and obsessive compulsive disorder: A systematic review and meta-analysis

February 1, 2020
Nayeri Chegeni, T., Sarvi, S. Amouei, A. Moosazadeh, M. Hosseininejad, Z. Aghayan, S. A. Daryani, A.
PLoS Neglected Tropical Diseases 19, 13
Click for abstract
Background A few studies investigated the relationship between toxoplasmosis and mental disorders, such as obsessive compulsive disorder (OCD). However, the specific nature of the association between Toxoplasma gondii (T. gondii) infection and OCD is not yet clear. The aim of this study was to collect information on the relationship between OCD and toxoplasmosis and assess whether patients with toxoplasmosis are prone to OCD. Methods For the purpose of this study, 6 major electronic databases and the Internet search engine Google Scholar were searched for the published articles up to July 30(th), 2018 with no restriction of language. The inverse variance method and the random effect model were used to combine the data. The values of odds ratio (OR) were estimated at 95% confidence interval (CI). Results A total of 9 case-control and 3 cross-sectional studies were included in our systematic review. However, 11 of these 12 articles were entered into the meta-analysis containing 9873 participants, out of whom 389 were with OCD (25.96% positive for toxoplasmosis) and 9484 were without OCD (17.12% positive for toxoplasmosis). The estimation of the random effect model indicated a significant common OR of 1.96 [95% CI: 1.32-2.90]. Conclusion This systematic review and meta-analysis revealed that toxoplasmosis could be as an associated factor for OCD (OR = 1.96). However, further prospective investigations are highly recommended to illuminate the underlying pathophysiological mechanisms of T. gondii infection in OCD and to better investigate the relationship between OCD and T. gondii infection. Author summary Toxoplasma gondii (T. gondii) is an obligate neurotropic parasite that infected about 25-30% of the total human population in the developed and developing countries. The obsessive compulsive disorder (OCD) is a psychiatric disease that affects the income and quality of life. Some studies confirmed an association between infectious agents as the associated or protective factors specifying the development of psychiatry diseases. Among various pathogens associated with psychological disorders, most of the attention is on T. gondii, which has a life-long asymptomatic latent phase after a short acute stage in healthy individuals. The detrimental effect of T. gondii on immunocompromised people and pregnant women is an important concern for public health. The correlation between toxoplasmosis and OCD is still relatively understudied with a paucity of documented findings. The previous meta-analysis reviewed only two studies and reported a 3.4-fold greater chance of OCD. The results of our study presented stronger evidence of a positive relationship between toxoplasmosis and OCD. Eventually, our research team hopes to present an overview of what is known and encourage more intensive research to determine the real impact of this parasite on the occurrence of OCD that may contribute to the prevention of OCD worldwid

Tagged: antibodies, bipolar disorder, gondii infection, Schizophrenia, statement

Mental healthReviews

The relationship between pediatric obsessive compulsive disorder and Toxoplasma gondii

February 1, 2020
Memik, N. C., Tamer, G. S., Unver, H., Gundogdu, O. Y.
Journal of Obsessive-Compulsive and Related Disorders 2015, 7: 24 - 28
Click for abstract
The rate of Toxoplasma gondii seropositivity in patients diagnosed with pediatric obsessive compulsive disorder (OCD) is investigated. Toxoplasma avidity levels, antitoxoplasma IgG, and antitoxoplasma IgM are investigated using the enzyme-linked immunosorbent assay (ELISA) method to examine the serums of 42 patients diagnosed with OCD (DSM-IV criteria) and 45 healthy individuals in the control group. Anti-toxoplasma IgG seropositivity was found in two patients (4.8%) among the pediatric OCD cases. Anti-toxoplasma IgM seropositivity was not detected in any patient. The toxoplasma avidity levels in patients determined to have anti-toxoplasma IgG seropositivity were 35 +/- 7.07. In the control group, however, antitoxoplasma IgG seropositivity was detected in four (8.9%) children. However, antitoxoplasma IgM seropositivity was not detected in any of the children, and the toxoplasma avidity level was 33 +/- 2.44. No statistically significant difference was found between the OCD group and the control group in terms of anti-toxoplasma IgG, anti-toxoplasma IgM seropositivity, and toxoplasma avidity level (p > 0.05). The results of our study indicate that toxoplasma infection has no major role in the etiology of pediatric OCD

Tagged: antibodies, childern, compulsion, diagnosis, Epidemiology, mental disorder, obsession, obsessive compulsion disorder, seropozitivity, Toxoplasma gondii, united-states

Mental health

Toxoplasma gondii – obsessive -compulsive disorder relationship: is it different in children?

February 1, 2020
Miman, O., Ozcan, O., Unal, S., Atambay, M.
Nordic Journal of Psychiatry 2019, 72: 501 - 505
Click for abstract
Background and aim: Obsessive-compulsive disorder (OCD) is a common neuropsychiatric illness. Although the etiology of OCD is still unknown, recent investigations have associated development of OCD with infectious illness. Toxoplasma gondii (T. gondii) is a neurotropic protozoan parasite that causes infection of the central nervous system. In the last decade, a lot of researches have focused on the possible relationship between exposure to T. gondii and neuropsychiatric disorders such as schizophrenia. Therefore, in this study, it was aimed to investigate a possible association between Toxoplasma infection and OCD in children and adolescents.Methods: We selected 55 patients with OCD (aged between 7 and 16 years) and 59 healthy children and adolescents (aged between 7 and 16 years), and investigated the seropositivity rate for anti-Toxoplasma IgG antibodies by enzyme-linked immunosorbent assay.Results: The seropositivity rate for anti-T. gondii IgG antibodies among OCD patients (21.82%) was found to be higher than the rate in control group (15.25%). However, the difference between the OCD group and the control group was not statistically significant (p>.05).Conclusion: In contrast to studies in adult patients, the results of this study do not support the relationship between T. gondii and OCD children and adolescents.

Tagged: adolescents, adolesent, antibodies, behavior, enzym-linked immunosorbent assay, Epidemiology, infection, obsessive-compulsive disorder-diagnosis-parasitology-psychology, Schizophrenia, Toxoplasma gondii

BehaviorMental health

Is there any association between Toxoplasma gondii infection and depression? A systematic review and meta-analysis

January 31, 2020
Chegeni, T. N., Sharif, M., Sarvi, S., Moosazadeh, M., Montazeri, M., Aghayan, S. A., Balalami, N. J., Gholami, S., Hosseininejad, Z., Saberi, R., Anvari, D., Gohardehi, S., Daryani, A.
PLoS ONE 2019, 14
Click for abstract
Background Toxoplasma gondii (T. gondii) is an obligate intracellular opportunistic parasite that is the causative agent of toxoplasmosis. This parasite accounts for mental disorders; however, the relationship between T. gondii infection and depressive disorder is unclear. Regarding this, the present systematic review and meta-analysis was conducted to investigate the scientific evidence regarding the potential association between major depression disorder (MDD) and Toxoplasma infection. Methods For the purpose of the study, the articles related to the subject of interest were systematically searched in seven electronic databases. Special attention was given to the studies examining T. gondii seropositivity level in depressed patients and controls. Results The search process resulted in the identification of a total of 30 publications meeting the inclusion criteria and published up to April 2018 for the systematic review. Furthermore, 29 studies met the inclusion criteria to be entered into meta-analysis. Our meta-analysis involved the review of cross-sectional studies including 1657 depressed patients and 19565 individuals as controls and case-control studies entailing 1311 depressed cases and 6015 controls without depression. 1582 depressed people participated in cross-sectional studies whose results were reported as odds ratio (OR). In addition, the total number of participants was 15068 in this type of studies. Statistical analysis indicated that the pooled OR of the risk of anti-T. gondii IgG antibody in depressed individuals in case-control and cross-sectional studies was 1.15 (95% confidence interval (CI): 0.95-1.39). Conclusions As the findings of the reviewed articles indicated, toxoplasmosis is not a risk factor for MDD. However, it is necessary to perform further research to clarify the detailed association between T. gondii and dysthymia or mild and moderate depression. Furthermore, it is recommended to better investigate the effect of antibody titers on the relationship between depression and T. gondii infection.

Tagged: antibodies, behavior, bipolar disorder, prevalence, psychiatric patients, risk factors, Schizophrenia, suicide

Mental health

Sero-prevalence of Toxoplasma gondii and associated risk factors among psychiatric outpatients attending University of Gondar Hospital, Northwest Ethiopia

January 31, 2020
Achaw, B., Tesfa, H., Zeleke, A.J., Worku, L., Addisu, A., Yigzaw, N., Tegegne, Y.
BMC Infectious Diseases 2019, 19 Ethiopia
Click for abstract
BackgroundToxoplasmosis is caused by an obligatory intracellular coccidian protozoan organism, Toxoplasma gondii. It has a worldwide distribution, affecting one-third of the world population. Psychiatric patients have a higher risk of exposure to Toxoplasma gondii infection due to lack of good personal hygiene. The burden of toxoplasmosis among psychiatric patients in Ethiopia has not been studied extensively. Thus, the study aimed to determine the seroprevalence of Toxoplasma gondii and associated risk factors among psychiatric outpatients at the University of Gondar Comprehensive and Specialized Hospital Psychiatric clinic.MethodsA cross-sectional study was conducted at the University of Gondar Comprehensive and Specialized Hospital from February to May 2018. Venous blood was collected from 304 study participants (152 psychiatric outpatients and 152 control groups). Anti-toxoplasma antibodies were determined using Onsite Toxo immunoglobulin G (IgG) and immunoglobulin M (IgM) Rapid Test. A Chi-square test was carried out to compare the two groups and a logistic regression analysis was conducted to check the association between variables. P-value less than 0.05 was taken as statistically significant.ResultsThe seroprevalence rate of anti-Toxoplasma gondii IgG antibodies was 33.6, and 16.4% in the psychiatric outpatients and the control samples, respectively. Anti-Toxoplasma gondii IgM sero-prevalence was 1.3% in the former patients and 3.9% in the latter group. Owing cat (AOR=2.862 95% CI=1.445-5.666 P=0.003), cleaning cat excreta (AOR=2.966 95% CI=1.317-2.652 P=0.007), and farming (AOR=2.058 95% CI=1.018-4.163 P=0.045) were found to be significantly associated with the sero-prevalence of anti-Toxoplasma gondii IgG antibody.ConclusionsThis study highlighted that, the prevalence of anti-Toxoplasma gondii IgG antibodies was significantly higher in psychiatric outpatients than the control group (p=0.001). Cat ownership, cleaning of cat excreta, and farming were found to be statistically significantly associated with the seroprevalence of anti-Toxoplasma gondii IgG antibody.

Tagged: antibodies, individuals, prevalence, psychiatria, Schizophrenia, seroprevalence, toxoplasmosis, voluntary blood dnors

Mental health

The association between Toxoplasma and the psychosis continuum in a general population setting

September 4, 2018
Lindgren, M., Torniainen-Holm, M., Harkanen, T., Dickerson, F., Yolken, R. H., Suvisaari, J.
Schizophrenia Research 2018; 193: 329-335
Click for abstract
Toxoplasma gondii infection is associated with increased risk for psychosis. However, the possible association between T. gondii and psychotic-like symptoms in the general adult population is unknown. We investigated whether T. gondii is associated with psychotic-like symptoms and psychosis diagnoses using data from Health 2000, a large cross-sectional health survey of the Finnish general population aged 30 and above. Seropositivity to toxoplasma was defined as a cutoff of 50 IU/ml of IgG antibodies. Lifetime psychotic-like symptoms were identified with section G of the Composite International Diagnostic Interview, Munich version (M-CIDI). Symptoms were considered clinically relevant if they caused distress or help-seeking or there were at least three of them. Lifetime psychotic disorders were screened from the sample and were diagnosed with DSM-IV using SCID-I interview and information from medical records. All data were available for 5906 participants. We adjusted for variables related to T. gondii seropositivity (age, gender, education, region of residence, cat ownership, and C-reactive protein measuring inflammation) in regression models. We found that T. gondii seropositivity was significantly associated with clinically relevant psychotic-like symptoms (OR 1.77, p = 0.001) and with the number of psychotic-like symptoms (IRR = 1.55, p = 0.001). The association between toxoplasma and diagnosed psychotic disorders did not reach statistical significance (OR 1.45 for schizophrenia). In a large sample representing the whole Finnish adult population, we found that serological evidence of toxoplasma infection predicted psychotic-like symptoms, independent of demographic factors and levels of C-reactive protein. Toxoplasma infection may be a risk factor for manifestation of psychotic-like symptoms.

Tagged: antibodies, c-reactive protein, diseases, disorders, gondii, high-risk, individuals, infectious agents, metaanalysis, population, psychotic disorder, psychotic-like symptom, Schizophrenia, Toxoplasma gondii

Mental health

Toxoplasma gondii as a possible causative pathogen of type-1 diabetes mellitus: Evidence from case-control and experimental studies

September 3, 2018
Beshay, E. V. N., El-Refai, S. A., Helwa, M. A., Atia, A. F., Dawoud, M. M.
Experimental Parasitology 2018; 188: 93-101
Click for abstract
Toxoplasma gondii is the causative parasite of an important worldwide disease. This obligate intracellular parasite can infect and replicate inside any nucleated cells including those of pancreas. Insulin is a hormone secreted by the pancreas and is responsible for controlling blood glucose concentration. Deficiency of insulin production accounts for the occurrence of type-1 diabetes mellitus (T1D). Thus, theoretically, toxoplasmosis could play a possible role in the development of T1D. However, the studies on this theory are still insufficient; therefore, this work was designed. Interestingly, in the case-control study, seropositivity of anti-Toxoplasma IgG was significantly higher among T1D (86.37%) in comparison with T2D (66.67%) and the control group (60%). Moreover, the odd ratio of chronic toxoplasmosis was 4.2 folds higher among T1D patients than among controls. The experimental study included acute and chronic Me49 T gondii infected mice groups in addition to a control group. Pathological examination revealed the presence of T gondii zoites adjacent to the islets of Langerhans and in pancreatic parenchyma of acutely infected mice. With chronic infection, there was a significant reduction of islets number and sizes in association with grade-1 insulitis. Additionally, the immunohistochemical study showed significant infiltration of the islets of chronically infected mice by CD8(+) and CD45(+) immune cells. In contrary to the control group, the islets of the chronic group showed significantly higher expression of the apoptotic marker caspase-3 and a significantly lower expression of the proliferation marker Ki69. Finally, a significant reduction of insulin expression in the islets of chronic infection group was detected in association with a significant increase in serum glucose concentrations; however, the establishment of diabetes did not occur throughout this work. Thus, this study presents an evidence for the probable role of chronic toxoplasmosis in the development of T1D which should be considered in further studies

Tagged: age, antibodies, apoptosis, beta-cell apoptosis, diabetes, france, history, infection, insulin, onset, pancreas, prevalence, risk factors, t. gondii

Physical health

Prevalence of Toxoplasma gondii infection in diabetic patients in Makkah AL Mukarramah, Saudi Arabia

September 3, 2018
Khalil, M., Baothman, M., Alserhan, F., Almunyif, A., Alsharbe, G., Samaren, H., Deqnah, N., Al Malki, A., Al Harbi, W.
Tropical Biomedicine 2018; 3: 464-471
Click for abstract
Toxoplasmosis is a parasitic and zoonotic disease caused by Toxoplasma gondii. The disease has worldwide distribution and all people maybe under the risk of getting infected by the parasite. The overall aim of this research was to detect the prevalence rate of anti-Toxoplasma gondii IgM and IgG among diabetic patients in Makkah, Saudi Arabia. Blood samples were collected from diabetic patients. Toxo IgM and IgG combo rapid test cassette were used to screen the samples, and the results were confirmed by using Enzyme-Linked Immunosorbent Assay (ELISA) to detect anti-IgM and anti-IgG antibodies on the plasma of 90 diabetic patients who attended the mobile clinic or AL Noor hospital in Makkah area. The subject was asked to complete a structured questionnaire. The questionnaire data and serological results were analyzed by using SPSS 20. Chi-square was used to compare different variables. Out of 90 samples, 39 (43.3%) were positive to anti-Toxoplasma gondii IgG wherein 33 (36.6%) of them were male and 6 (6.7%) were female. The age ranged between 13-85 years with the mean of 49.9 years. The study found that there were statistical differences between the age groups with higher prevalence in the 50-65 years age group. Detection of IgM against T. gondii gave negative results. The results of the study indicate that latent T. gondii in diabetic patient are relatively high especially among the 50-65 age group. There were significant associated between direct contact with a cat and infection by T. gondii (p<0.05).

Tagged: animals, antibodies, history, mellitus, metaanalysis, pregnant women, seroprevalence

Physical health

Is Toxoplasma gondii playing a positive role in multiple sclerosis risk? A systematic review and meta-analysis

August 31, 2018
Saberi, R., Sharif, M., Sarvi, S., Aghayan, S. A., Hosseini, S. A., Anvari, D., Chegeni, T. N., Hosseininejad, Z., Daryani, A.
Journal of Neuroimmunology 2018;322: 57-62
Click for abstract
Toxoplasmosis is a parasitic disease caused by Toxoplasma gondii with a globally widespread distribution. The aim of this systematic review and meta-analysis was to characterize the association between T. gondii infection and multiple sclerosis (MS). The data were systematically collected from the English electronic databases up to April 2017. The research process resulted in the identification of five studies related to the subject of interest entailing 669 MS patients and 770 controls. The pooled prevalence rates of T. gondii infection in the MS patients and controls were estimated as 32.4% (95% CI: 27.4-38.6) and 39.1% (95% CI: 29.1-50.5), respectively. By random effect model, the combined odds ratio was 0.72 (95% CI: 0.49-1.06) with P = .0961. Although this meta-analysis study showed a lower seroprevalence of T. gondii in the MS patients as compared with that in the control group, no significant association was found between toxoplasmosis and MS disease. Further investigations are recommended to determine the detailed association between MS patients and T. gondii infection.

Tagged: antibodies, autoimmune, brain-development, diseases, family-members, hygiene hypothesis, infection, meta-analysis, multiple sclerosis, Parasite, responses, Schizophrenia, systematic review, Toxoplasma gondii

Physical health

Immunoglobulin sub-class distribution in bipolar disorder and schizophrenia: potential relationship with latent Toxoplasma Gondii infection

August 31, 2018
Bengoufa, H. D., Godin, O., Doukhan, R., Guen, E. L.,Daban-Huard, C. , Bennabi, M., Delavest, M., Lepine, J. P., Boukouaci, W., Laouamri,H., Houenou, J., Jamain, S., Richard, J. R. , Lecorvosier, P. , Yolken, R., Rajagopal, K., Leboyer, M., Tamouza, R.
Bmc Psychiatry 2018; 18
Click for abstract
Background: Immune dysfunction could play a significant role in the pathogenesis of bipolar disorder (BD) and schizophrenia (SZ), conditions with an underlying pro-inflammatory state. Studies on humoral immune responses (which reflects antibody mediated fight against pathogens) in schizophrenia and bipolar disorder are sparse and often providing contradictory results. The aim of this study was to assess humoral immunity in a group of stable bipolar disorder and schizophrenia patients compared to controls by determining total Immunoglobulins and IgG subclasses and to assess their association with latent Toxoplasma gondii and/or CMV infection. Methods: 334 subjects (124 BD, 75 SZ and 135 Healthy Controls [HC]) were included and tested for humoral immunity by determining the total immunoglobulins (IgG,A and M) and IgG subclasses (IgG1, IgG2, IgG3, IgG4) and their relationship with latent Toxoplasma gondii infection, an established risk factor for BD and SZ. Results: Although lower levels of IgG, IgG1, IgG2, IgG4 and IgA were found among BD as compared to HC and/or SZ, after adjustment for confounding variables, only low levels of IgG and IgG1 in BD remai- ned significant. Strikingly highest levels of antibodies to T. gondii (but not CMV) infection in BD and SZ were associated with lowest levels of IgG3 and IgG4 levels as compared to controls. Conclusions: Schizophrenia and bipolar disorder patients with latent T. gondii specific infection may be more vulnerable to changes in immuno-inflammatory processes than controls with similar latent infectious state. Simultaneous sequential immunological monitoring both in steady state and active disease phases in the same BD and SZ patients are warranted to understand the role of Toxoplasma gondii latency in these disorders.

Tagged: antibodies, association, bipolar disorder, cognitive deficits, gondii, humoral immunity, immunoglobulins, individuals, inflammation, metaanalysis, risk, scale, Schizophrenia, Toxoplasma gondii

Mental health

Chronic Toxoplasma gondii infection induces anti-N-methyl-D-aspartate receptor autoantibodies and associated behavioral changes and neuropathology

February 12, 2018
Li, Y, Viscidi, R. P., Kannan, G., McFarland,R., Pletnikov, M. V., Severance,E. G., Yolken, R. H., Xiao, J. C.
Infection and Immunity 2018; 86: DOI: 10.1128/iai.00398-18
Click for abstract
Anti-NMDA receptor (NMDAR) autoantibodies have been postulated to play a role in the pathogenesis of NMDAR hypofunction, which contributes to the etiology of psychotic symptoms. Toxoplasma gondii is a pathogen implicated in psychiatric disorders and associated with elevation of NMDAR autoantibodies. However, it remains unclear whether parasite infection is the cause of NMDAR autoantibodies. By using mouse models, we found that NMDAR autoantibody generation had a strong temporal association with tissue cyst formation, as determined by MAGI antibody seroreactivity (r = 0.96; P < 0.0001), which is a serologic marker for the cyst burden. The presence of MAGI antibody response, but not T. gondii IgG response, was required for NMDAR autoantibody production. The pathogenic relevance of NMDAR autoantibodies to behavioral abnormalities (blunted response to amphetamine-triggered activity and decreased locomotor activity and exploration) and reduced expression of synaptic proteins (the GLUN2B subtype of NMDAR and PSD-95) has been demonstrated in infected mice. Our study suggests that NMDAR autoantibodies are specifically induced by persistent T. gondii infection and are most likely triggered by tissue cysts. NMDAR autoantibody seroreactivity may be a novel pathological hallmark of chronic toxoplasmosis, which raises questions about NMDAR hypofunction and neurodegeneration in the infected brain.

Tagged: Amphetamine, antibodies, autoantibody, behavioral abnormalities, chronic infection, Dopamine, encephalitis, expression, gondii, hos, immune-response, MAGI antibody, mice, neuropathology, nmda receptor, tissue cyst, Toxoplasma gondii

BehaviorMental health

Immunoglobulin sub-class distribution in bipolar disorder and schizophrenia: potential relationship with latent Toxoplasma Gondii infection

February 12, 2018
Hamdani,N. ,Bengoufa, D. , Godin, O., Doukhan, R.., Le Guen,E., Daban-Huard, C. , Bennabi, M. ,Delavest, M., Lepine, J. P., Boukouaci, W. , Laouamri, H. , Houenou,J., Jamain, S., Richard,J. R. , Lecorvosier, P. , Yolken,R. , Rajagopal, K. , Leboyer, M. , Tamouza, R.
BMC Psychiatry,10.1186/s12888-018-1821-9, Article Number 239
Click for abstract
Background: Immune dysfunction could play a significant role in the pathogenesis of bipolar disorder (BD) and schizophrenia (SZ), conditions with an underlying pro-inflammatory state. Studies on humoral immune responses (which reflects antibody mediated fight against pathogens) in schizophrenia and bipolar disorder are sparse and often providing contradictory results. The aim of this study was to assess humoral immunity in a group of stable bipolar disorder and schizophrenia patients compared to controls by determining total Immunoglobulins and IgG subclasses and to assess their association with latent Toxoplasma gondii and/or CMV infection. Methods: 334 subjects (124 BD, 75 SZ and 135 Healthy Controls [HC]) were included and tested for humoral immunity by determining the total immunoglobulins (IgG,A and M) and IgG subclasses (IgG1, IgG2, IgG3, IgG4) and their relationship with latent Toxoplasma gondii infection, an established risk factor for BD and SZ. Results: Although lower levels of IgG, IgG1, IgG2, IgG4 and IgA were found among BD as compared to HC and/or SZ, after adjustment for confounding variables, only low levels of IgG and IgG1 in BD remai- ned significant. Strikingly highest levels of antibodies to T. gondii (but not CMV) infection in BD and SZ were associated with lowest levels of IgG3 and IgG4 levels as compared to controls. Conclusions: Schizophrenia and bipolar disorder patients with latent T. gondii specific infection may be more vulnerable to changes in immuno-inflammatory processes than controls with similar latent infectious state. Simultaneous sequential immunological monitoring both in steady state and active disease phases in the same BD and SZ patients are warranted to understand the role of Toxoplasma gondii latency in these disorders.

Tagged: antibodies, association, bipolar disorder, cognitive deficits, gondii, humoral immunity, immunoglobulins, individuals, inflammation, metaanalysis, risk, scale, Schizophrenia, Toxoplasma gondii herpes-simplex-virus

Mental health

Seroepidemiological study of Toxoplasma gondii infection among psychiatric patients in Mashhad, Northeast of Iran

October 3, 2017
Abdollahian, E., Shafiei, R., Mokhber, N., Kalantar, K., Fata, A.
Iranian Journal of Parasitology 2017; 12: 117-122
Click for abstract
Background: Psychiatric patients have an increased risk of some infections like toxoplasmosis. Investigations on Toxoplasma gondii infection among psychiatric patients have been limited in Mashhad, Northeast of Iran. In this case-control study, prevalence of T. gondii was investigated by serological method. Methods: This case-control study was performed among psychiatric patients admitted to Avicenna Hospital in Mashhad, Northeast of Iran. Three hundred and fifty inpatients and 350 controls were examined in 2012-2013 for detection of IgG and IgM antibodies against T. gondii in their blood sera by ELISA. Socio-demographic and clinical manifestations of the patients were obtained. Results: Anti-T. gondii IgG antibodies was found in 164 (46.85%) of 350 psychiatric inpatients and 120 (34.28%) of 350 controls. Seventeen (4.85%) of psychiatric individuals and 3 (0.85%) of control group were IgM+/IgG-indicating acute form of toxoplasmosis. There were no statistically significant differences between the case and control groups. In patient group, schizophrenic patients had the highest positive rate (46.28%) and bipolar mood disorder had the second most prevalent rate (20%). Of 162 schizophrenia patients, 65 (40.1%) had latent infection which was higher than that observed in controls. Conclusion: The prevalence of T. gondii infection among psychiatric patients suffering from schizophrenia was more in Mashhad, compared with control group.

Tagged: 1st-episode, antibodies, elisa, individuals, prevalence, psychiatric patients, recent-oneset schizophrenia, seroprevalence, Toxoplasma gondii, women

Mental health

Toxoplasma gondii and schizophrenia: a review of published RCTs

October 2, 2017
Chorlton, S.D.
Parasitology Research 2017; 116: 1793-1799
Click for abstract
Over the last 60 years, accumulating evidence has suggested that acute, chronic, and maternal Toxoplasma gondii infections predispose to schizophrenia. More recent evidence suggests that chronically infected patients with schizophrenia present with more severe disease. After acute infection, parasites form walled cysts in the brain, leading to lifelong chronic infection and drug resistance to commonly used antiparasitics. Chronic infection is the most studied and closely linked with development and severity of schizophrenia. There are currently four published randomized controlled trials evaluating antiparasitic drugs, specifically azithromycin, trimethoprim, artemisinin, and artemether, in patients with schizophrenia. No trials have demonstrated a change in psychopathology with adjunctive treatment. Published trials have either selected drugs without evidence against chronic infection or used them at doses too low to reduce brain cyst burden. Furthermore, trials have failed to achieve sufficient power or account for confounders such as previous antipsychotic treatment, sex, age, or rhesus status on antiparasitic effect. There are currently no ongoing trials of anti-Toxoplasma therapy in schizophrenia despite ample evidence to justify further testing.

Tagged: antibodies, artemisinin, azithromycin, bipolar disorder, chronic, efficacy, infection, metaanalysis, mice, minocycline, Schizophrenia, Toxoplasma, treatment, trimethoprim

Mental health

The association between Toxoplasma and the psychosis continuum in a general population setting

October 2, 2017
Lindgren, M., Torniainen-Holm, M., Yolken, R., Suvisaari, J.
Schizophrenia Bulletin 2017; 43: S108-S109
Click for abstract
Background: An increased prevalence of antibodies to Toxoplasma gondii has been found to be associated with psychosis. An association with positive symptom severity in a psychosis risk sample has also been reported. However, the possible association between toxoplasma and positive symptoms in the general population is unknown. Methods: We investigated whether Toxoplasma gondii is associated with psychosis diagnoses and psychotic symptoms in the general population. We used data from Health 2000, a large health survey of the Finnish population aged 30 and older (n = 5906). Levels of IgG antibodies to Toxoplasma gondii were determined and seropositivity defined as a cutoff of 50 IU/ml. Lifetime psychotic symptoms were identified with section G of the Composite International Diagnostic Interview, Munich version (M-CIDI). The CIDI screen was considered positive if the interviewee reported any clinically relevant symptom or at least 3 symptoms regardless of clinical relevance. Lifetime psychotic disorders were screened from the sample and were diagnosed with DSM-IV using case notes and SCID-I interview. The possible diagnoses were: any psychotic disorder, functional psychosis, schizophrenia, other nonaffective psychosis, and affective psychosis. Results: The seroprevalence of Toxoplasma in the population was 13%; 12% of the participants reported at least one psychotic symptom, the most common symptoms being delusions of reference and suspicion, and 4% were considered positive for the CIDI screen. In a logistic regression model, toxoplasma seropositivity was the only significant predictor of the CIDI screen status, when other variables associated with toxoplasma were adjusted for (age, gender, education, region of residence, cat ownership, and C-reactive protein measuring inflammation). Toxoplasma infection was not associated with any psychosis diagnoses. Conclusion: In a large sample representing the whole Finnish population aged 30 and older, we found that toxoplasma infection predicted psychotic symptoms but not psychosis diagnoses. The association between psychotic symptoms and toxoplasma was not explained by inflammation.

Tagged: affective disorders, antibodies, c-reactive protein, delusions, diagnostic and statistical manual, finnish, gender, health surveys, igg antibody, infection, inflammation, ownership, patient interview, psychotic, psychotic disorders, psychotic symptom, Schizophrenia, seroprevalence, severe combined immunodeficiency, Toxoplasma, Toxoplasma gondii

Mental health

Assessment of Toxoplasma seropositivity in children suffering from anxiety disorders

May 4, 2017
Afsharpaiman, S., Khosravi, M.H., Mahmoodinejad, M., Shirbazoo, S., Amirsalari, S., Torkaman, M., Radfar, S.
Iranian Journal of Child Neurology 2017; 11: 32-37
Click for abstract
Objective This study aimed to assess the seroprevalence of Toxoplasma gondii in children with anxiety disorders. Materials & Methods This cross-sectional study was conducted between Sep 2012 and May 2013 in Pediatrics Clinic of Baqiyatallah Hospital, Tehran, Iran. Children were assessed clinically. Diagnosis of patients with anxiety disorders was based on DSM-4 system, performed by child psychiatrist. Then their anti-Toxoplasma antibodies were measured. A questionnaire was verbally administered to all individuals' parents including demographic information and questions about life style, family history, medical history, economic situation, residence, nutritional patterns and contact with animals. Results Ninety-six male and female cases with a mean age of 8.56 +/- 2.5 and 8.42 +/- 1.9 yr underwent analysis. Anti-T. gondii IgG antibody was found in one case of each group. There was no significant difference between case and control groups for serum Toxoplasma IgG antibody (P=0.14). No case individuals had Anti-T. gondii IgM antibody, while it was found in one control individual. No significant difference was seen between case and control groups for Toxoplasma IgM antibody (P=0.27). Conclusion Toxoplasmosis has no direct effect on the incidence of anxiety disorders. More studies are needed with a larger volume of individuals in future.

Tagged: antibodies, anxiety disorders, Toxoplasma gondii, toxoplasmosis

Mental health

Evidence of increased exposure to Toxoplasma gondii in individuals with recent onset psychosis but not with established schizophrenia

May 4, 2017
Yolken, R., Torrey, E.F., Dickerson, F.
PLOS Neglected Tropical Diseases 2017; 10.1371/journal.pntd.0006040
Click for abstract
AB A possible role for Toxoplasma gondii in the etiopathogenesis of schizophrenia is supported by epidemiological studies and animal models of infection. However, recent studies attempting to link Toxoplasma to schizophrenia have yielded mixed results. We performed a nested case-control study measured serological evidence of exposure to Toxoplasma gondii in a cohort of 2052 individuals. Within this cohort, a total of 1481 individuals had a psychiatric disorder and 571 of were controls without a psychiatric disorder. We found an increased odds of Toxoplasma exposure in individuals with a recent onset of psychosis (OR 2.44, 95% Confidence Interval 1.4-4.4, p < .003). On the other hand, an increased odds of Toxoplasma exposure was not found in individuals with schizophrenia or other psychiatric disorder who did not have a recent onset of psychosis. By identifying the timing of evaluation as a variable, these findings resolve discrepancies in previous studies and suggest a temporal relationship between Toxoplasma exposure and disease onset.

Tagged: antibodies, association, bipolar disorder, drugs, immunoglobulin-g, infections, metaanalysis, sample

Mental health

Toxoplasmosis, leptospirosis, and brucellosis seroepidemiology in veterinary medical students and their relation with unique health

January 4, 2017
Clazer, M., Rodrigues, G. V., Ferreira, B. P. M., Zaniolo, M. M., Correa, N. A. B., Fortes, M. S., Navarro, I. T., Chiderolli, R. T., de Freitas, J. C., Goncalves, D. D.
Semina-Ciencias Agrarias, 2017, 38: 1347-1359
Click for abstract
Toxoplasmosis, leptospirosis, and brucellosis are global zoonoses, with humans as accidental participants in their transmission cycles. The can also be considered occupational diseases, because certain professionals are at greater risk of contact and infection by such zoonoses. These three diseases have different epidemiological characteristics because of the distinct environmental, social, cultural, and economic conditions where these pathogens circulate. Because of the importance of these diseases and their associations with specific occupations, we performed a seroepidemiological survey of Toxoplasma, Leptospira, and Brucella antibodies, with an analysis of the association between positive serum and certain occupational and environmental variables, in students of a veterinary medicine course (1st, 2nd, 3rd, 4th, and 5th year) in a university in the northwestern region in the state of Parana, Brazil. From May to November 2014, blood samples were collected from 157 volunteers by professionals trained in nursing and biomedicine from the same university as the veterinary students. At the time of blood collection, the students did not present any clinical signs of the three diseases of interest. To detect anti-Toxoplasma gondii, anti-Leptospira spp., and anti-Brucella antibodies, indirect immunofluorescence test (IIF), microscopic agglutination test (MAT), fast agglutination test (a screening test), and enzyme-linked immunosorbent assay (ELISA) were performed. To determine variables associated with these infections, the students were interviewed to complete an epidemiological questionnaire with environmental, behavioral, and occupational information. The associations between these variables and infections were assess by chi-square or Fischer's exact tests, with a 5% significance level (a). Of the 157 serum samples analyzed, 29.29% reacted to Toxoplasma antigens, with titers ranging from 16 to 4096 by IIF, 1.27% to Leptospira antigens, with titers ranging from 100 to 800 by MAT using Hardjo and Wolffi serovars, and 0.63% to Brucella antigens by ELISA; however, no variables were found to be associated with infection with any of these pathogens. The results of this study show that one-third of the students in the veterinary medicine course were exposed to Toxoplasma gondii, Leptospira spp., and Brucella spp. at some stage in their lives; however, it is not possible to determine whether these infections were acquired at the university, because no associations between occupational risk variables and these infections were found. An understanding of the transmission of each etiological agent and methods to prevent infection is important to maintain low prevalence levels of these zoonotic diseases during the veterinary medicine course and extra-curricular internships, when there is increased exposure to these pathogens.

Tagged: animals, antibodies, bovine brucellosis, brazil, brucella spp., gondii, high prevalence, humans, infection, leptospira spp., occupational disease, parana, state, Toxoplasma gondii, Zoonosis

Physical health

Effects of cumulative herpesviridae and Toxoplasma gondii infections on cognitive function in healthy, bipolar, and schizophrenia subjects

January 3, 2017
Hamdani, N., Daban-Huard, C.,. Godin, O., Laouamri, H., Jamain, S., Attiba, D., Delavest, M., Lepine, J. P., Le Corvoisier, P., Houenou, J., Richard, J. R., Yolken, R. H., Krishnamoorthy, R., Tamouza, R., Leboyer, M., Dickerson, F. B.
Journal of Clinical Psychiatry 2017, 78: 18-27
Click for abstract
Objective: Schizophrenia and bipolar disorder are associated with cognitive impairment leading to social disruption. While previous studies have focused on the effect of individual infectious exposure, namely, Herpesviridae viruses or Toxoplasma gondii (T gondii), on cognitive functioning, the objective of the present study was to examine the effect of multiple infections on cognitive functioning in patients with schizophrenia and bipolar disorder and in healthy controls. Methods: Seropositivity to herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2), cytomegalovirus (CMV), and T gondii was related to cognitive status among 423 participants (recruited between 2008 and 2014; 138 patients with bipolar disorder, 105 patients with schizophrenia [DSM-IV criteria], and 180 healthy controls) for episodic verbal memory (California Verbal Learning Test), working memory (Wechsler Adult Intelligence Scale, third edition), and premorbid intelligence quotient (National Adult Reading Test). Results: Seropositivity to and antibody levels of HSV-1 were significantly associated with working memory, which persisted after correction (backward digit span: beta = -0.10 [0.05], chi(2) = 33.89, P = .0001) in the overall sample. This association was particularly strong in the control group (beta = -0.18 [0.08], P = .04, Z = -3.55, P = .0008; corrected P = .012). Further, cumulative exposure to HSV-1, HSV-2, and CMV viruses and T gondii parasite was also associated with lower scores on working memory as measured by backward digit span in the overall sample (Z = 2.86, P = .004; Z = 2.47, P = .01; and Z = 3.35, P = .01, respectively). Conclusions: Exposures to Herpesviridae and T gondii parasite seem to impact cognitive functioning. Because infections caused by Herpesviridae and/or T gondii parasite are quite common in the (general) population, assessing and confirming the cognitive impairment among those who have cumulative exposures is useful and of interest.

Tagged: antibodies, cytomegalovirus, deficits, exposure, herpes-simplex-virus, impairment, lithium-carbonate, psychiatric-disorder, risk, type-1

Cognitive functionsMental health

Infection and inflammation in schizophrenia and bipolar disorder

January 3, 2017
Tanaka, T., Matsuda, T., Hayes, L. N., Yang, S. J., Rodriguez, K., Severance, E. G., Yolken, R. H., Sawa, A., Eaton, W. W.
Neuroscience Research 2017; 115: 59-63
Click for abstract
The present study investigated the relationship between exposure to infectious agents and inflammation markers in individuals with schizophrenia (SZ), bipolar disorder (BP), and controls without a psychiatric disorder. We measured plasma levels of antibodies and innate immune markers and correlated them with clinical symptoms and cognitive function. In both SZ and BP, we found an increase in soluble CD14, and in BP an increase in C-reactive protein, IgM class antibodies against cytomegalovirus (CMV), and IgG class antibodies against herpes simplex virus 2. Furthermore in BP, we observed a negative relationship between IgG antibodies against CMV and scores for cognitive function. (C) 2016 Elsevier Ireland Ltd and Japan Neuroscience Society. All rights reserved.

Tagged: agents, antibodies, antibody level, bipolar disorder, cognitive deficits, glial tnf-alpha, individuals, inflammation, markers, metaanalysis, neurocognition, recent-onset schizophrenia, Schizophrenia, synapses, Toxoplasma gondii

Mental health

Bipolar disorder with psychotic features and ocular toxoplasmosis

January 3, 2017
Del Grande, C., Contini, C., Schiavi, E., Rutigliano, G., Maritati, M., Seraceni, S., Pinto, B., Dell'Osso, L., Bruschi, F.
Journal of Nervous and Mental Disease 2017; 205: 192-195
Click for abstract
Recent evidence suggests the involvement of Toxoplasma gondii infection in the emergence of psychotic and affective disorders. In this report, we describe the case of a young Brazilian woman affected by recurrent ocular toxoplasmosis and presenting with a manic episode with psychotic features in the context of a diagnosis of Bipolar Disorder (BD), type I. We observed a relationship between ocular manifestations and the clinical course of bipolar illness, confirmed by molecular analyses (nested-PCR), as well as by the high level of T. gondii specific IgG. This case report is the first showing the presence of circulating parasite DNA at the time of occurrence of psychiatric symptoms, thus providing further support for a possible role of the parasite in the pathogenesis of some cases of BD.

Tagged: antibodies, bipolar disorder, gondii infection, individuals, metaanalysis, mood disorders, nested pcr, ocular toxoplasmosis, psychosis, rating-scale, retinochoroiditis, Schizophrenia, seropositivity, suicide attempts, toxoplasma gondii infection

Mental health

Seroprevalence of Toxoplasma gondii infection and its as- sociated risk factors in neuropsychiatric patients in Jazan Province, Saudi Arabia

November 20, 2016
Zaki, W. M., Hofdi, R. Y., Shebiley, A. A., Saadi, Z. A.,Ageel, A. H.
J. Egypt. Soc. Parasitol. 2016; 46: 467-474
Click for abstract
Toxoplasma gondii has worldwide distribution in nearly one-third of the human population. It is a neurotropic protozoan parasite so a potential role of T. gondii infection for some neuropsychiatric disorders was postulated. Patients with psychiatric disorders had high toxoplasmosis se- roprevalence. Limited information about toxoplasmosis seroprevalence in psychiatric patients was known in southern area of Saudi Arabia. The current cross sectional case control study aims at determination of the prevalence of T. gondii IgG & IgM in neuropsychiatric patients in Jazan Province. A total of 162 neuropsychiatric patients from Al-Amal hospital for psychiatric health and 162 subjects without neuropsychiatric manifestations from Jazan General Hospital, Jazan City, KSA. were enrolled in the study. Psychiatric diagnosis was based on the International Classification of Diseases-10 (ICD-10 classification). Serological analysis for latent toxoplasmosis (IgG) and active toxoplasmosis (IgM) was done using Enzyme Linked Immunosorbent Assay (ELISA). Investigations for the association with socio-demographic, clinical and behavioral characteristics in psychiatric patients were also done. The serofrequency of IgG antibodies among neuropsychiatric patients was significantly higher than that of the controls (35.8% vs 14.8%) P = 0.0022. OR 3.2 with 95% CI= (1.4952 to 6.8774). However; serofrequency of toxoplasma IgM antibody between neuro-psychiatric patients and controls was not statistically significant (P > 0.05).,Bivariate and multivariate analysis for socio-demographics and possible associated risk factors showed that contact to cats and/or dogs, eating under cooked meat, and contact to soil were significantly higher in neuropsychiatric patients than controls.

Tagged: animals, antibodies, case-control studies, cats, central nervous system infections/blood/diagnosis/epidemiology/*parasitology, cross-sectional studies, dogs, humans, immunoglobulin G/blood, Immunoglobulin M/blood, meat/parasitology, mental disorders/blood*complications/epidemiology/*etiology, multivariate analysis, odds ratio, protozoan/blood, risk factors, Saudi Arabia/epidemiology, seroepidemiologic studies, Toxoplasma, Toxoplasmosis/blood/*complications/*diagnosis/epidemiology

Mental health

Seroprevalence of Toxoplasma gondii infection and its as- sociated risk factors in neuropsychiatric patients in Jazan province, Saudi Arabia

October 30, 2016
Zaki, W. M., Hofdi, R. Y., Shebiley, A. A., Saadi, Z. A., Ageel, A. H.
Journal of the Egyptian Society of Parasitology 2016; 240: 1-8
Click for abstract
Toxoplasma gondii has worldwide distribution in nearly one-third of the human population. It is a neurotropic protozoan parasite so a potential role of T. gondii infection for some neuropsychiatric disorders was postulated. Patients with psychiatric disorders had high toxoplasmosis se- roprevalence. Limited information about toxoplasmosis seroprevalence in psychiatric patients was known in southern area of Saudi Arabia. The current cross sectional case control study aims at determination of the prevalence of T. gondii IgG & IgM in neuropsychiatric patients in Jazan Province. A total of 162 neuropsychiatric patients from Al-Amal hospital for psychiatric health and 162 subjects without neuropsychiatric manifestations from Jazan General Hospital, Jazan City, KSA. were enrolled in the study. Psychiatric diagnosis was based on the International Classification of Diseases-10 (ICD-10 classification). Serological analysis for latent toxoplasmosis (IgG) and active toxoplasmosis (IgM) was done using Enzyme Linked Immunosorbent Assay (ELISA). Investigations for the association with socio-demographic, clinical and behavioral characteristics in psychiatric patients were also done. The serofrequency of IgG antibodies among neuropsychiatric patients was significantly higher than that of the controls (35.8% vs 14.8%) P = 0.0022. OR 3.2 with 95% CI= (1.4952 to 6.8774). However; serofrequency of toxoplasma IgM antibody between neuro-psychiatric patients and controls was not statistically significant (P > 0.05).,Bivariate and multivariate analysis for socio-demographics and possible associated risk factors showed that contact to cats and/or dogs, eating under cooked meat, and contact to soil were significantly higher in neuropsychiatric patients than controls.

Tagged: animals, antibodies, case-control studies, cats, central nervous system infections/blood/diagnosis/epidemiology/*parasitology, cross-sectional studies, dogs, humans, immunoglobulin G/blood, Immunoglobulin M/blood, meat/parasitology, mental disorders/blood/*complications/epidemiology/*etiology, multivariate analysis, odds ratio, protozoan/blood, risk factors, Saudi Arabia/epidemiology, seroepidemiologic studies, Toxoplasma, Toxoplasmosis/blood/*complications/*diagnosis/epidemiology

Mental health

Sero-prevalence of anti- Toxoplasma gondii antibodies among patients with neuropsychiatric disorders: Epilepsy and depression

October 30, 2016
Abd El-Aal, N. F., Saber, M., Fawzy, N., Ashour, W. R.
Journal of the Egyptian Society of Parasitology 2016; 46: 729-736
Click for abstract
Toxoplasma gondii infection is concerned to have an association with epilepsy and depression either as a cause or a potential risk factor for their occurrence. Nevertheless, there has been long-standing interest in investigating this possible association, the evidence for such relationship is yet not conclusive. The current study correlated between T. gondii infection and Neuropsychiatric disorders: epilepsy and depression, through serological valuation of anti-Toxoplasma immunoglobulin (Ig) G antibodies. In the current study, 112 patients suffered from epilepsy (72 cryptogenic and 40 non-cryptogenic), 118 had depression and 60 healthy volunteers that had no history of any neuropsychiatric disorders in their first degree relatives were enrolled. Full history taking, complete physical examination, cranial magnetic resonance imaging (MRI), scalp electroencephalography (EEG), a structured questionnaire and T. gondii specific IgG antibody ELISA were performed to all groups. The results showed that the anti-Toxoplasma IgG antibodies were detected among cases with cryptogenic epilepsy 34.7% (25 out of 72 cases), non-cryptogenic epilepsy 2.5% (1 out of 40) and depression 20.3% (24 out of 118) groups compared to healthy. control group (11.7%). There were significant associations between T. gondii seropositivity of epilepsy and depression groups in age, residence, contact with pets and social class compared to control healthy group (p<0.05). Youth and adults had the highest sero-T. gondii infection especially male in rural areas with low social class.

Tagged: adolescent, adult, antibodies, child, depression/*blood/etiology, epilepsy/*blood/etiology, female, humans, infant, male, middle aged, preschool, protozoan/*blood, seroepidemiologic studies, Toxoplasma/*immunology, Toxoplasmosis/*immunology/parasitology, young adult

Mental health

Temporal cognitive decline associated with exposure to infectious agents in a population-based, aging cohort

October 29, 2016
Nimgaonkar, V. L., Yolken, R. H., Wang, T. X., Chang, C. C. H., McClain, L., McDade, E., Snitz, B. E., Ganguli, M
Alzheimer Disease & Associated Disorders 2016; 30: 216-222
Click for abstract
Background:Numerous cross-sectional studies have related exposure to neurotropic infectious agents with cognitive dysfunction in older adults, however, the temporal sequence is uncertain.Methods:In a representative, well-characterized, population-based aging cohort, we determined whether the temporal trajectories of multiple cognitive domains are associated with exposure to cytomegalovirus (CMV), Herpes Simplex virus, type 1 (HSV-1), Herpes Simplex virus, type 2 (HSV-2), or Toxoplasma gondii (TOX). Complex attention, executive functions, memory, language, and visuospatial function were assessed annually for 5 years among consenting individuals. Study entry IgG antibody titers indexing exposure to each infectious agent were examined in relation to slopes of subsequent temporal cognitive decline using multiple linear regressions adjusted for potential confounders.Results:The IgG levels for HSV-2 were significantly associated with baseline cognitive domain scores (N=1022 participants). Further, the IgG levels for HSV-2, TOX, and CMV, but not HSV-1 were significantly associated with greater temporal cognitive decline that varied by type of infection.Conclusions:Exposure to CMV, HSV-2, or TOX is associated with cognitive deterioration in older individuals, independent of general age-related variables. An increased understanding of the role of infectious agents in cognitive decline may lead to new methods for its prevention and treatment.

Tagged: aging, antibodies, bipolar disorder, CMV, cognition, community, cytomegalovirus, disease, Epidemiology, herpes virus, impairment, persistent infection, Schizophrenia, simplex-virus type-1, Toxoplasma gondii, viral-infections

Cognitive functions

Infection and characterization of Toxoplasma gondii in human induced neurons from patients with brain disorders and healthy controls

October 3, 2016
Passeri E, Jones-Brando, L Bordon, C Sengupta, S Wilson, AM Primerano, A Rapoport, JL Ishizuka, K Kano, S Yolken, RH Sawa, A
Microbes and Infection 2016; 18: 153-158
Click for abstract
Toxoplasma gondii is a protozoan parasite capable of establishing persistent infection within the brain. Serological studies in humans have linked exposure to Toxoplasma to neuropsychiatric disorders. However, serological studies have not elucidated the related molecular mechanisms within neuronal cells. To address this question, we used human induced neuronal cells derived from peripheral fibroblasts of healthy individuals and patients with genetically-defined brain disorders (i.e. childhood-onset schizophrenia with disease-associated copy number variations). Parasite infection was characterized by differential detection of tachyzoites and tissue cysts in induced neuronal cells. This approach may aid study of molecular mechanisms underlying individual predisposition to Toxoplasma infection linked to neuropathology of brain disorders

Tagged: antibodies, bipolar disorder, brain, cells, conversion, cysts, diseases, disorders, fibroblasts, functional-neurons, induced neuronal cells, risk, Schizophrenia, tachyzoites, Toxoplasma gondii

Physical health

Toxoplasma gondii-A gastrointestinal pathogen associated with human brain diseases

October 3, 2016
Severance, E. G., Xiao, J., Jones-Brando, L., Sabunciyan, S., Li, Y., Pletnikov, M., Prandovszky, E., Yolken, R.
In: Cryan JF, Clarke G, eds. Gut Microbiome and Behavior 2016: pp. 143-163. (International Review of Neurobiology).
Click for abstract
Serious psychiatric disorders such as schizophrenia, bipolar disorder, and major depression are important causes of mortality and morbidity worldwide. While these are primarily diseases involving altered brain functioning, numerous studies have documented increased rates of gastrointestinal inflammation and dysfunction in many individuals with these disorders. Toxoplasma gondii is an apicomplexan protozoan intracellular parasite with a widespread distribution in both developed and developing countries. Toxoplasma organisms enter the ecosystem through the shedding of oocysts by Toxoplasma-infected felines. In almost all cases of postnatal human infection, Toxoplasma enters its hosts through the intestinal tract either by the ingestion of oocysts or by the consumption of meat from food animals which themselves were infected by Toxoplasma oocysts. It had previously been thought that most cases of Toxoplasma infection in immune competent children and adults were inapparent and asymptomatic. However, recent studies cast doubt on this concept as exposure to Toxoplasma has been associated with a range of acute and chronic symptoms. Of particular note has been the finding of an increased rate of a range of neurological and psychiatric disorders associated with serological evidence of Toxoplasma exposure. A role of Toxoplasma infection in brain diseases is also supported by the consistent finding of altered cognition and behavior in animal models of infections. Much of the attention relating to the role of Toxoplasma infection in neuropsychiatric disorders has focused on the brain, where Toxoplasma tissue cysts can persist for extended periods of time. However, recent discoveries relating to the role of the gastrointestinal tract in cognition and behavior suggest that Toxoplasma may also increase susceptibility to human brain diseases through immune activation, particularly involving the gastrointestinal mucosa. The study of the pathways relating to the pathobiology and immunology of Toxoplasma infection may provide insights into the pathogenesis of a range of human neuropsychiatric disorders as well as into cognitive functioning in otherwise healthy individuals.

Tagged: agents, antibodies, bipolar disorder, individuals, infection, inflammatory-bowel-disease, risk factors, Schizophrenia, self-directed violence, united-states

Cognitive functionsMental health

Seroprevalence of Toxoplasma gondii infection among patients with non-schizophrenic neurodevelopmental disorders in Alexandria, Egypt

October 3, 2016
Shehata AI, Hassanein FI, Abdul-Ghani R
Acta Tropica 2016; 154: 155-159
Click for abstract
Toxoplasma gondii is an opportunistic parasite with neurotropic characteristics that can mediate neurodevelopmental disorders, including mental, behavioral and personality aspects of their hosts. Therefore, the seroprevalence of anti-Toxoplasma antibodies has been studied in patients with different neurological disorders from different localities. On searching online databases, however, we could not find published studies on the seroprevalence of anti-Toxoplasma antibodies among patients with neurodevelopmental disorders in Egypt. Therefore, the present preliminary study was conducted to determine the serological profile of T. gondii infection among patients with non -schizophrenic neurodevelopmental disorders in Alexandria, Egypt. Data and blood samples were collected from 188 patients recruited for the study from four mental rehabilitation centers in the period from July 2014 to March 2015. The overall seropositivity rates of IgM and IgG among patients were 16.5% (31/188) and 50.0% (94/188), respectively. Of the studied patients' characteristics, only age was significantly associated with anti-Toxoplasma IgG seropositivity, with older patients being about twice more likely exposed to infection. However, no statistically significant association was found with IgM. In addition, seropositivity of anti-Toxoplasma IgG, but not IgM, was significantly associated with non-schizophrenic neurodevelopmental disorders; however, neither IgG nor IgM showed a significant association with cognitive impairment as indicated by the intelligence quotient scores.

Tagged: alexandria, antibodies, behavior, cerebral-palsy, children born, deficits, diagnosis, governorate, neurodevelopmental disorder, pregnancy, risk, Schizophrenia, seroprevalence, Toxoplasma gondii

Mental health

Seroprevalence of Toxoplasma gondii infection among patients with non-schizophrenic neurodevelopmental disorders in Alexandria, Egypt

May 28, 2016
Shehata, A. I., Hassanein, F. I., Abdul-Ghani, R.
Acta Tropica 2016; 154: 155-159
Click for abstract
Toxoplasma gondii is an opportunistic parasite with neurotropic characteristics that can mediate neurodevelopmental disorders, including mental, behavioral and personality aspects of their hosts. Therefore, the seroprevalence of anti-Toxoplasma antibodies has been studied in patients with different neurological disorders from different localities. On searching online databases, however, we could not find published studies on the seroprevalence of anti-Toxoplasma antibodies among patients with neurodevelopmental disorders in Egypt. Therefore, the present preliminary study was conducted to determine the serological profile of T. gondii infection among patients with non -schizophrenic neurodevelopmental disorders in Alexandria, Egypt. Data and blood samples were collected from 188 patients recruited for the study from four mental rehabilitation centers in the period from July 2014 to March 2015. The overall seropositivity rates of IgM and IgG among patients were 16.5% (31/188) and 50.0% (94/188), respectively. Of the studied patients' characteristics, only age was significantly associated with anti-Toxoplasma IgG seropositivity, with older patients being about twice more likely exposed to infection. However, no statistically significant association was found with IgM. In addition, seropositivity of anti-Toxoplasma IgG, but not IgM, was significantly associated with non-schizophrenic neurodevelopmental disorders; however, neither IgG nor IgM showed a significant association with cognitive impairment as indicated by the intelligence quotient scores.

Tagged: alexandria, antibodies, behavior, cerebral-palsy, children born, deficits, diagnosis, governorate, neurodevelopmental disorder, pregnancy, risk, Schizophrenia, seroprevalence, Toxoplasma gondii

Cognitive functionsMental health

Seroprevalence of anti-Toxoplasma IgG and IgM among individuals who were referred to medical laboratories in Mazandaran province, northern Iran

May 25, 2016
Sharif, M., Daryani, A., Ebrahimnejad, Z., Gholami, S., Ahmadpour, E., Borhani, S., Lamsechi, N.
Journal of Infection and Public Health 2016; 9: 75-80
Click for abstract
Toxoplasma gondii (T. gondii) is a protozoan parasite that can cause toxoplasmosis in humans. However, there is no current data regarding Toxoplasma infection among individuals who were referred to medical laboratories in Mazandaran province (northern Iran). Therefore, we performed a population-based study of Toxoplasma seroprevalence in this region. A total of 1832 sera samples (from 654 men and 1178 women) were collected from people who were referred to medical laboratories in different cities throughout Mazandaran province between March and July 2012. The serum titers of anti-T. gondii IgG and IgM were measured using enzyme-linked immunosorbent assays. The seroprevalence of anti-Toxoplasma IgG was 55.5%; and 14.4% of the positive samples were seropositive for anti-Toxoplasma IgM. The highest seroprevalence was observed among people who were >50 years old (90.6%), and the lowest seroprevalence was observed among children who were 0-9 years old (9.4%; P < 0.001). There was no significant difference in the seroprevalences for each sex in the study population. However, a regional sex-specific difference in seroprevalence was observed between men (54.1%) and women (70.6%; P = 0.003) in the western cities of Mazandaran. As the seroprevalence of T. gondii in western and eastern Mazandaran was higher than that in the central cities, there is a need to evaluate the nature of the infection chain in these areas

Tagged: amazonas, antibodies, children, community, laboratory testing, patient referral, people, risk factors, Schizophrenia, schoolchildren, serological survey, seroprevalence, Toxoplasma gondii, toxoplasmosis

Mental health

Exposure to perinatal infections and bipolar disorder: A systematic review

May 24, 2016
Barichello, T., Badawy, M., Pitcher, M. R., Saigal, P., Generoso, J. S., Goularte, J. A., Simoes, L. R., Quevedo, J., Carvalho, A. F.
Curr Mol Med 2016; 16: 106-118
Click for abstract
Bipolar disorder (BD) is a debilitating psychiatric disorder and a growing global public health issue. Notwithstanding BD has been conceptualized as a neuroprogressive illness, there are some evidences to suggest a role for neurodevelopmental pathways in the patho-etiology of this disorder. Evidences on the associations between perinatal infections and risk for bipolar disorder have been inconsistent across studies. Here, we performed a systematic review of observational studies on the relationship between exposure to perinatal pathogens and bipolar disorder. A computerized literature search of the PubMed, Embase, and PsyINFO databases till January 31st, 2015 was performed. Twenty-three studies ultimately met inclusion criteria. Studies investigated exposure to several pathogens namely Cytomegalovirus (CMV), Epstein-Barr Virus (EBV), Herpes simplex virus-1 (HSV-1), Herpes simplex virus-2 (HSV-2), Human herpesvirus 6 (HHV-6), Toxoplasma gondii, Influenza, and Varicella zoster virus (VZV). Overall, studies provided mixed evidences. Thus, contrary to schizophrenia, the role of perinatal infections as risk factors for BD remain inconclusive. Larger studies with a prospective design would be necessary to elucidate the role of previous exposure to infectious agents as a potential risk factor for BD.

Tagged: antibodies, bipolar disorder, cerebrospinal fluid, cognitive impairment, cytomegalovirus, herpes, herpes-simplex encephalitis, individuals, influenza, maternal infection, metaanalysis, psychiatric patients, Schizophrenia, systematic review, Toxoplasma gondii, toxoplasma gondii infection

Mental healthReproductionReviews

Hepatitis C virus antibody titers associated with cognitive dysfunction in an asymptomatic community-based sample

May 24, 2016
Ibrahim, I., Salah, H., El Sayed, H., Mansour, H., Eissa, A., Wood, J., Fathi, W., Tobar, S., Gur, R. C., Gur, R. E., Dickerson, F., Yolken, R. H., El Bahaey, W., Nimgaonkar, V.
Journal of Clinical and Experimental Neuropsychology 2016; 38; : 861-868, 10.1080/13803395.2016.1168780
Click for abstract
BACKGROUND: Hepatitis C virus (HCV) infection is associated with cognitive dysfunction in clinic-based studies. The risk could be attributed to factors such as antiviral medications, substance abuse, or coincidental infection. AIM: The aim was to evaluate cognitive function in relation to HCV antibody titers in a community-based sample of asymptomatic individuals at low risk for substance abuse. METHOD: Adults were ascertained from a community in Mansoura, Egypt, where HCV is endemic (n = 258). Cognitive performance was evaluated using the Arabic version of the Penn Computerized Neurocognitive Battery. Substance abuse and psychopathology were also assessed. Antibodies to HCV and Toxoplasma gondii (TOX), a common protozoan that can affect cognition, were estimated using serological IgG assays. RESULTS: The prevalence of HCV and TOX infection was 17.6% and 52.9%, respectively. HCV antibody titers were significantly associated with worse function in four cognitive tests for accuracy and three tests for speed, after adjusting for covariates (p < .05, beta coefficients, 2.1-3.2). TOX antibody titers were associated with impaired accuracy in one test. CONCLUSIONS: The association between HCV antibody titers and cognitive impairment is not mediated by antiviral treatment or substance abuse in this sample. Whether HCV has a causal role in the cognitive dysfunction should be investigated.

Tagged: adult, antibodies, cognitive dysfunction, cross-sectional studies, Hepacivirus/*immunology, Hepatitis C, humans, middle aged, young adult

Cognitive functionsMental health

Seroprevalence of Toxoplasma gondii infection among patients with non-schizophrenic neurodevelopmental disorders in Alexandria, Egypt

May 24, 2016
Shehata, A.I., Hassanein, F.I., Abdul-Ghani, R.
Acta Tropica 2016;154: 155-159
Click for abstract
Toxoplasma gondii is an opportunistic parasite with neurotropic characteristics that can mediate neurodevelopmental disorders, including mental, behavioral and personality aspects of their hosts. Therefore, the seroprevalence of anti-Toxoplasma antibodies has been studied in patients with different neurological disorders from different localities. On searching online databases, however, we could not find published studies on the seroprevalence of anti-Toxoplasma antibodies among patients with neurodevelopmental disorders in Egypt. Therefore, the present preliminary study was conducted to determine the serological profile of T. gondii infection among patients with non -schizophrenic neurodevelopmental disorders in Alexandria, Egypt. Data and blood samples were collected from 188 patients recruited for the study from four mental rehabilitation centers in the period from July 2014 to March 2015. The overall seropositivity rates of IgM and IgG among patients were 16.5% (31/188) and 50.0% (94/188), respectively. Of the studied patients' characteristics, only age was significantly associated with anti-Toxoplasma IgG seropositivity, with older patients being about twice more likely exposed to infection. However, no statistically significant association was found with IgM. In addition, seropositivity of anti-Toxoplasma IgG, but not IgM, was significantly associated with non-schizophrenic neurodevelopmental disorders; however, neither IgG nor IgM showed a significant association with cognitive impairment as indicated by the intelligence quotient scores.

Tagged: alexandria, antibodies, behavior, cerebral-palsy, children born, deficits, diagnosis, governorate, neurodevelopmental disorder seroprevalence, pregnancy, risk, Schizophrenia, Toxoplasma gondii

BehaviorMental health

Seroprevalence of Toxoplasma gondii infection among patients in Hospital Universiti Sains Malaysia

May 24, 2016
Mohamed, Z., Hajissa, K.
Tropical Biomedicine 2016; 33: 78-83
Click for abstract
Toxoplasmosis is a worldwide endemic zoonotic infection caused by the obligate coccidian parasite Toxoplasma gondii. To assess the seroprevalence of T. gondii infection among hospital population of Hospital Universiti Sains Malaysia (HUSM), a cross-sectional study was conducted using serum samples of 102 participants. Samples were screened for the presence of anti-Toxoplasma IgG and IgM antibodies by enzyme-linked immunosorbent assay (ELISA). Only one sample recorded as IgM positive (0.98%) (1/102; 95% CI = 0.02-5.34%), whereas 44.12% (45/102; 95% CI = 34.29-54.29%) were IgG positive. The study showed that seroprevalence of toxoplasmosis significantly differs between age groups (p < 0.001), with high prevalence of T. gondii infection (37.8%) among patients aged less than one month. Moreover, the study indicated a significant difference in the prevalence of toxoplasmosis between males and females. Additionally, a significant dependent relationships were observed (p = 0.003), when the reasons of toxoplasma serology request was considered, and the highest prevalence (59.6%) observed in congenital toxoplasmosis. In conclusion, the seroprevalence of toxoplasmosis in our study group was high. The study provides preliminary information about the seroprevalence and epidemiology of T. gondii infection among the hospital population in HUSM.

Tagged: antibodies, antigens, history, peninsular malaysia, pregnant women, risk factors, Schizophrenia

Mental health

Assessment of Toxoplasma sweropositivity in children suffering from attention deficit hyperactivity disorder

January 4, 2016
Afsharpaiman, S., Khosravi, M. H., Faridchehr, M., Komijani, M., Radfar, S., Amirsalari, S., Torkaman, M., Shirbazoo, S.
Galen Medical Journal 2016; 5: 188-193
Click for abstract
Background: Toxoplasmosis, a protozoan infection caused by Toxoplasma gondii, is suggested to be a risk factor for many psychological disorders such as schizophrenia and depression. Attention deficit hyperactivity disorder (ADHD) is one of the most common psychiatric disorders among children. Previous studies have assessed the correlation between ADHD and infectious diseases like toxoplasmosis. So we aimed to investigate the possible correlation between Toxoplasma seropositivity and ADHD in children. Materials and Methods: In this cross-sectional study children with signs of ADHD were regarded as patients and underwent clinical assessments. Diagnosis of these patients was based on DSM-IV-TR system which was performed by a pediatric psychiatrist. Forty-eight Children without signs of ADHD or other psychic disorders were considered as control, and 48 patients were considered as case group. Parents were asked to answer a questionnaire including demographic, pregnancy and habitual questions. Blood samples were taken from all individuals and assessed for anti-Toxoplasma IgM and IgG antibodies. Results: Ninety-six male and female patients with a mean age of 8.12 years underwent analysis. Seropositivity rate for anti-T.gondii IgG antibody was 4.2% in the case and 2.1% in control individuals (P=0.92). Anti-T.gondii IgM antibodies were not found in control individuals while it was found in 2.1% of case individuals (P=0.74). There was no statistically significant association between seroprevalence of IgM (P=0.74) and IgG (P=0.92) antibodies and ADHD in study individuals. Conclusion: Our findings showed that the toxoplasmosis seropositivity has no significant difference between children with and without ADHD. Further studies are needed with a larger amount of individuals.

Tagged: antibodies, attention deficit hyperactivity disorder, children, gondii, metaanalysis, population, risk factors, Schizophrenia, Toxoplasma gondii, toxoplasmosis

Mental health

Association between latent toxoplasmosis and clinical course of schizophrenia – continuous course of the disease is characteristic for Toxoplasma gondii-infected patients

October 9, 2015
Celik, T., Kartalci, S., Aytas, O., Akarsu, G. A., Gozukara, H., Unal, S.
Folia Parasitologica 2015; 62
Click for abstract
The aim of the present study was to investigate the association between various clinical aspects of schizophrenia and seropositivity against Toxoplasma gondii (Nicolle et Manceaux, 1908). We selected 94 patients with schizophrenia and investigated the seropositivity rate for anti-T. gondii IgG antibodies by ELISA. Clinical parameters of schizophrenic patients such as illness type and status, clinical course, awareness of the illness and need for electroconvulsive therapy (ECT) were compared with their serological status. Anti-T. gondii IgG antibodies were detected in 43 (46%) of schizophrenic patients. Chronic patients had a rate of 34 (72%) seropositivity, whereas 9 (22%) of the patients with partial remission showed evidence of latent toxoplasmosis. Of continuous patients, 35 (81%) were found to be seropositive and this rate was significantly more than in the other groups. The rate of latent toxoplasmosis was detected significantly higher in patients who lack awareness of schizophrenia (36, i.e. 72%) than the patients who were aware of their illnesses (7, i.e. 16%). Anti-T. gondii IgG antibodies were detected in 38 (70%) of ECT performed patients while this percentage was 13% in the ones who had never been treated with ECT. This difference was also statistically significant. We showed that Toxoplasma-infected subjects had 15x higher probability of having continuous course of disease than Toxoplasma-free subjects. Our results put forth the possibility of latent toxoplasmosis to have a negative impact on the course of schizophrenia and treatment response of schizophrenic patients.

Tagged: agents, antibodies, cell-cultures, CMV, Dopamine, individuals, mechanism, mice, prognosis, risk factors, schizophrenia patients, serology, toxoplasmosis

Mental health

Toxoplasma gondii infection in cancer patients: Prevalence, risk factors, genotypes and association with clinical diagnosis

October 9, 2015
Cong, W., Liu, G. H., Meng, Q. F., Dong, W., Qin, S. Y., Zhang, F. K., Zhang, X. Y., Wang, X. Y., Qian, A. D.,
Cancer Letters 2015; 359: 307-313
Click for abstract
Prevalence of human infection with Toxoplasma gondii has been increasing in China due to the increasing number of cats. However, little is known of the epidemiology of T. gondii infection in different cancer patient groups. Thus, a case-control study of 900 cancer patients and 900 controls was conducted to detect anti-T. gondii antibodies by ELISA in China. Genomic DNA was extracted from the diseased tissues of 510 patients and the T. gondii B1 gene was amplified using a semi-nested PCR. DNA samples giving positive B1 amplification were then genetically characterized using multi-locus PCR-RFLP. The prevalence of anti-T. gondii IgG in cancer patients (35.56%) was significantly higher than that in controls (17.44%). The highest T. gondii seroprevalence was detected in lung cancer patients (60.94%), followed by cervical cancer patients (50%), brain cancer patients (42.31%) and endometrial cancer patients (41.67%). Exposure with soil and consumption of raw/undercooked meat were significantly associated with T. gondii infection in cancer patients. Three T. gondii genotypes (ToxoDB#9, ToxoDB#10 and Type I variant) were identified. In conclusion, T gondii infection is a severe problem in cancer patients and it is imperative that improved integrated measures should be conducted to prevent and control T gondii infection in cancer patients.

Tagged: america, antibodies, cancer-patients, china, clonal lineages, comprise, europe, genetic-characterization, genotype, oocysts, pregnant women, prevalence, risk factors, strains, Toxoplasma gondii

Physical health
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  • Mortality Patterns of Toxoplasmosis and Its Comorbidities in Tanzania: A 10-Year Retrospective Hospital-Based Survey February 6, 2020
  • The role of latent toxoplasmosis in the aetiopathogenesis of schizophrenia–the risk factor or an indication of a contact with cat? February 6, 2020
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