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Toxoplasma gondii & Human Phenotype

Compendium of Known Effects and Ongoing Research

case-control studies

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 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

Is chronic toxoplasmosis a risk factor for diabetes mellitus? A systematic review and meta-analysis of case-control studies

October 6, 2016
Majidiani, H., Datuand, S., Daryani, A., Galuan-Ramirez, M. D., Foroutan-Rad, M.
Brazilian Journal of Infectious Diseases 2016; 20: 605-609.
Click for abstract
INTRODUCTION: The global protozoan parasite, Toxoplasma gondii, infects many warm-blooded animals and humans by employing different transmission routes. There have been some recent studies on the probable relevance of infectious agents and diabetes. Therefore, we conducted a systematic review and meta-analysis to identify the possible association between chronic toxoplasmosis and diabetes mellitus. METHODS: This study was conducted following the general methodology recommended for systematic reviews and meta-analysis. Nine English literature databases (Google scholar, PubMed, Scopus, Web of science, Science Direct, Ovid, ProQuest, IngentaConnect, and Wiley Online Library) were searched, up to January 2016. Random effects model was used to determine odds ratios and their 95% confidence intervals. RESULTS: Our review resulted in a total of seven publications meeting the inclusion criteria. Because of significant heterogeneity, we estimated a common OR by a random effects model at 1.10 (95% CI=0.13-9.57) with p=0.929 and 2.39 (95% CI=1.20-4.75) with p=0.013 for type 1 and type 2 diabetes mellitus, respectively. CONCLUSION: Despite the limitations such as low number of studies, this meta-analysis suggests chronic toxoplasmosis as a possible risk factor for type 2 DM. However, based on random effects model no statistically significant association was observed between T. gondii and type 1 DM. It is highly recommended for researchers to carry out more accurate studies aiming to better understand this association.

Tagged: case-control studies, chronic disease, diabetes mellitus/*parasitology, humans, risk factors, toxoplasmosis/*complications

Physical healthReviews

Toxoplasma gondii seropositivity is negatively associated with multiple sclerosis

October 6, 2015
Stascheit, F., Paul, F., Harms, L., Rosche, B.
Journal of Neuroimmunology 2015; 285: 119-124
Click for abstract
Background: Toxoplasma (T.) gondii is a ubiquitous intracellular parasitic protozoan that was recently associated with various autoimmune diseases. Objectives: We aimed to investigate the prevalence of T. gondii IgG and IgM antibodies between MS patients and healthy controls. Methods: Sera from 163 MS, 91 clinically isolated syndrome cases and 178 age and gender matched controls were evaluated for the prevalence of T. gondii IgG antibodies utilizing chemiluminescent immunoassay (ARCHITECT). Results: MS-patients showed a significantly lower prevalence for T. gondii IgG antibodies compared to controls (333% vs. 47.9%; p = 0.011, OR = 1.8 (95% CI 12-3.2)). Conclusion: The results demonstrate a negative association between an infection with the parasite T. gondii and the presence of MS.

Tagged: antibodies, case-control studies, cigarette-smoking, environmental risk-factors, hygiene hypothesis, infection, multiple sclerosis, parasitic infections, Toxoplasma gondii

Physical health

High seroprevalence of Toxoplasma gondii infection in a subset of Mexican patients with work accidents and low socioeconomic status

October 16, 2012
Alvarado-Esquivel, C., Torres-Castorena, A., Liesenfeld, O., Estrada-Martinez, S., Urbina-Alvarez, J. D.
Parasites & Vectors 2012;5: Artn 13 10.1186/1756-3305-5-13
Click for abstract
BACKGROUND: Toxoplasma gondii has been associated with reflex impairment and traffic accidents. It is unknown whether Toxoplasma infection might be associated with work accidents. Therefore, using a case-control seroprevalence study design, 133 patients with a recent work accident and 266 control subjects of the general population from the same region were examined with enzyme-linked immunoassays for the presence and levels of anti-Toxoplasma IgG antibodies and anti-Toxoplasma IgM antibodies. Socio-demographic, work, clinical and behavioral characteristics from each worker were obtained. RESULTS: Eleven (8.3%) of 133 patients, and 14 (5.3%) of 266 controls had anti-T. gondii IgG antibodies. Anti-T. gondii IgG levels were higher than 150 IU/ml in 8 (6%) patients and 10 (3.8%) controls. Anti-T. gondii IgM antibodies were found in one (0.8%) of the workers, and in 6 (2.3%) of the controls. No statistically significant differences in the IgG seroprevalences, frequencies of high IgG levels, and IgM seroprevalences among patients and controls were found. In contrast, a low socio-economic level in patients with work accidents was associated with Toxoplasma seropositivity (P = 0.01). Patients with work accidents and low socioeconomic status showed a significantly (OR = 3.38; 95% CI: 0.84-16.06; P = 0.04) higher seroprevalence of T. gondii infection than controls of the same socioeconomic status (15.1% vs. 5%, respectively). Multivariate analysis showed a positive association of T. gondii infection with boar meat consumption (OR = 3.04; 95% CI: 1.03-8.94; P = 0.04). In contrast, a negative association between T. gondii infection and national trips (OR = 0.40; 95% CI: 0.17-0.96; P = 0.04), sausage consumption (OR = 0.20; 95% CI: 0.05-0.68; P = 0.01), and ham consumption (OR = 0.16; 95% CI: 0.05-0.51; P = 0.002) was found. CONCLUSIONS: In the study described here seropositivity to T. gondii was associated to work accidents in a subset of patients with low socioeconomic status. This is the first report of an association of T. gondii infection and work accidents. Further studies to confirm our results are needed. Results may help in designing optimal prevention strategies to avoid T. gondii infection.

Tagged: accidents, adolescent, adult, aged, antibodies, case-control studies, enzyme-linked immunosorbent assay, female, humans, immunoglobulin G/blood, Immunoglobulin M/blood, male, Mexico/epidemiology, middle aged, multivariate analysis, occupational, protozoan/blood, risk factors, seroepidemiologic studies, social class, Toxoplasma/*immunology, toxoplasmosis/*epidemiology/parasitology, young adult

Behavior

Maternal antibodies to infectious agents and risk for non-affective psychoses in the offspring–a matched case-control study

October 16, 2012
Blomstrom, A., Karlsson, H., Wicks, S., Yang, S. J., Yolken, R. H., Dalman, C.
Schizophrenia Research 2012; 140: 25-30
Click for abstract
BACKGROUND: An increasing number of studies suggest that certain maternal infections are associated with non-affective psychoses in the offspring. Here we investigated if maternal exposure to Toxoplasma gondii, cytomegalovirus (CMV), herpes simplex virus type 1 (HSV-1) or type 2 (HSV-2) prior to delivery was associated with future diagnosis of schizophrenia or other non-affective psychoses in the offspring. METHODS: This case-control study included 198 individuals born in Sweden 1975-85, diagnosed with schizophrenia (ICD-10, F20) and other non-affective psychoses (ICD-10, F21-29) as in- or outpatients, and 524 matched controls. Specific immunoglobulin G (IgG) levels in archived neonatal dried blood samples from these individuals were determined by immunoassays. Reference levels were determined by prevalences among pregnant women in Sweden 1975-85. Odds ratios (OR) for schizophrenia and other non-affective psychoses were calculated, considering maternal and gestational factors as covariates. RESULTS: Levels of IgG directed at T. gondii corresponding to maternal exposure was associated with subsequent schizophrenia (OR=2.1, 95% CI 1.0-4.5) as were levels of IgG directed at CMV (OR=2.2, 95% CI 1.0-5.1) but not at HSV-1 or -2. There were even stronger associations with higher levels of T. gondii or CMV antibodies. There were no associations between any of the infectious agents and other non-affective psychoses. CONCLUSIONS: This study supports findings of maternal exposure to T. gondii and schizophrenia risk in offspring, and extends the risk to also include maternal exposure to CMV. Future studies should confirm the association with CMV exposure and identify mechanisms underlying these associations.

Tagged: adult, case-control studies, cytomegalovirus/immunology, female, humans, immunoglobulin G/blood, male, maternal exposure, odds ratio, pregnancy, psychotic disorders/blood/*immunology, risk factors, schizophrenia/*immunology/parasitology/virology, simplexvirus/immunology, Sweden, Toxoplasma/*immunology

Mental health

Does Toxoplasma gondii infection affect cognitive function? A case control study

October 16, 2012
Guenter, W., Bielinski, M., Deptula, A., Zalas-Wiecek, P., Piskunowicz, M., Szwed, K., Bucinski, A., Gospodarek, E., Borkowska, A.
Folia Parasitologica 2012; 59: 93-98.
Click for abstract
According to studies, latent Toxoplasma gondii infection may affect several functions of the human brain. Here we search for the association between latent toxoplasmosis and cognitive performance. We tested 70 individuals for latent T. gondii infection. There were 26 Toxoplasma-infected subjects and 44 Toxoplasma-free subjects. Within these two groups we assessed cognitive performance using a set of standardized, widely recognized neuropsychological tests: Trail Making Test, Stroop Test, Verbal Fluency Test, Digit Span Test and N-back test. The relationship between chronic toxoplasmosis and cognitive performance was assessed, with adjustment for age and sex. Patients with latent toxoplasmosis performed worse on one neuropsychological test, N-back Test--percentage of correct answers (beta -8.08; 95% CI - 15.64 to -0.53; p < 0.05) compared to seronegative patients. However, after adjustment for age and sex, no statistically significant associations between latent toxoplasmosis and the scores on any cognitive tests were noticed. As statistically significant relationship was not observed, this study does not confirm that chronic latent T. gondii infection affects cognition.

Tagged: adult, antibodies, case-control studies, chronic disease, cognition disorders/*parasitology, female, humans, immunoglobulin G/blood, male, middle aged *Toxoplasma, protozoan/blood, toxoplasmosis/*complications, young adult

Cognitive functions

Serum antibodies to Toxoplasma gondii and Herpesvidae family viruses in individuals with schizophrenia and bipolar disorder: a case-control study

October 16, 2011
Tedla, Y., Shibre, T., Ali, O., Tadele, G., Woldeamanuel, Y., Asrat, D., Aseffa, A., Mihret, W., Abebe, M., Alem, A., Medhin, G., Habte, A.
Ethiopian Medical Journal 2011; 49: 211-220
Click for abstract
BACKGROUND: Recent etiological studies for schizophrenia and bipolar disorder have focused on the protozoan Toxoplasma gondii and Herpesvirdae family viruses. OBJECTIVE: To determine the magnitude of T. gondii, cytomegalovirus (CMV), herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2) infection in individuals with schizophrenia, bipolar disorder and healthy controls by using serologic diagnostic methods. MATERIAL AND METHODS: Serologic diagnostic method was used to determine the prevalence and level of antibodies to T gondii, CMV HSV-1 and HSV-2 in individuals with schizophrenia, bipolar disorder, and unaffected controls recruited from Butajira, Ethiopia. The study was conducted from March to May 2009. A total of 495 serum samples were analysed for the presence and level of immunoglobulin G (IgG) to T. gondii, CMV HSV-1, and HSV-2. RESULTS: The seroprevalence of T gondii infection was higher in individuals with schizophrenia [adjusted odds ratio = 4.7; 95% CI (1.5, 15.1)] and bipolar disorder [adjusted odds ratio = 3.0; 95% CI (1.1, 8.6)] than in unaffected controls. The level of IgG to CMV was also significantly higher in individuals with schizophrenia and bipoar disorder than in unaffected controls. Younger individuals with schizophrenia (< 25 years old) also had a significantly higher level of IgG to CMV than matched unaffected controls. CONCLUSION: This study provides additional evidence that infection with 7T gondii and CMV may be associated with some cases of schizophrenia and bipolar disorder. Additional studies should focus on antibodies to these agents in the sera and CSF of individuals with recent-onset psychosis.

Tagged: *ctomegalovirus infections/diagnosis/epidemiology, *herpes simplex/diagnosis/epidemiology, *toxoplasmosis/diagnosis/epidemiology, adolescent, adult, antibodies, bipolar disorder/epidemiology/*parasitology/virology, case-control studies, cytomegalovirus/immunology/isolation & purification, Ethiopia/epidemiology, female, herpesviridae/immunology/isolation & purification, herpesvirus 1, herpesvirus 2, human/immunology/isolation & purification, humans, immunoglobulin G/blood, male, middle aged, prevalence, protozoan/blood, risk factors, schizophrenia/epidemiology/*parasitology/*virology, seroepidemiologic studies, Toxoplasma/immunology/isolation & purification, viral/blood, young adult

Mental health

Topics

  • Behavior 105
  • Cognitive functions 64
  • Mental health 439
  • Morphology 6
  • Motor functions 10
  • Personality 36
  • Physical health 134
  • Reproduction 36
  • Reviews 40
  • Sensory functions 3
  • Uncategorized 2

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Recent articles

  • 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
  • The Association between Toxoplasma gondii Infection and Risk of Parkinson’s Disease: A Systematic Review and Meta-Analysis February 6, 2020

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