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Toxoplasma gondii & Human Phenotype

Compendium of Known Effects and Ongoing Research

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A social cost-benefit analysis of two One Health interventions to prevent toxoplasmosis

January 31, 2020
Suijkerbuijk, A. W. M., Over, E. A. B., Opsteegh, M., Deng, H. F., van Gils, P. F., Marinovic, A. A. B., Lambooij, M., Polder, J. J., Feenstra, T. L., van der Giessen, J. W. B., de Wit, G. A., Mangen, M. J. J.
PLoS ONE 2019, 14
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In the Netherlands, toxoplasmosis ranks second in disease burden among foodborne pathogens with an estimated health loss of 1,900 Disability Adjusted Life Years and a cost-of-illness estimated at (sic)45 million annually. Therefore, effective and preferably cost-effective preventive interventions are warranted. Freezing meat intended for raw or undercooked consumption and improving biosecurity in pig farms are promising interventions to prevent Toxoplasma gondii infections in humans. Putting these interventions into practice would expectedly reduce the number of infections; however, the net benefits for society are unknown. Stakeholders bearing the costs for these interventions will not necessary coincide with the ones having the benefits. We performed a Social Cost-Benefit Analysis to evaluate the net value of two potential interventions for the Dutch society. We assessed the costs and benefits of the two interventions and compared them with the current practice of education, especially during pregnancy. A 'minimum scenario' and a 'maximum scenario' was assumed, using input parameters with least benefits to society and input parameters with most benefits to society, respectively. For both interventions, we performed different scenario analyses. The freezing meat intervention was far more effective than the biosecurity intervention. Despite high freezing costs, freezing two meat products: steak tartare and mutton leg yielded net social benefits in both the minimum and maximum scenario, ranging from (sic)10.6 million to (sic)31 million for steak tartare and (sic)0.6 million to (sic)1.5 million for mutton leg. The biosecurity intervention would result in net costs in all scenarios ranging from (sic)1 million to (sic)2.5 million, due to high intervention costs and limited benefits. From a public health perspective (i.e. reducing the burden of toxoplasmosis) and the societal perspective (i.e. a net benefit for the Dutch society) freezing steak tartare and leg of mutton is to be considered.

Tagged: beef, congenital toxoplasmosis, dalys, frozen storage, pathogens

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Disease tolerance in Toxoplasma infection

January 31, 2020
Melchor, S. J., Ewald, S. E.
Frontiers in Cellular and Infection Microbiology 2019, 9
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Toxoplasma gondii is a successful protozoan parasite that cycles between definitive fetid hosts and a broad range of intermediate hosts, including rodents and humans. Within intermediate hosts, this obligate intracellular parasite invades the small intestine, inducing an inflammatory response. Toxoplasma infects infiltrating immune cells, using them to spread systemically and reach tissues amenable to chronic infection. An intact immune system is necessary to control life-long chronic infection. Chronic infection is characterized by formation of parasite cysts, which are necessary for survival through the gastrointestinal tract of the next host. Thus, Toxoplasma must evade sterilizing immunity, but still rely on the host's immune response for survival and transmission. To do this, Toxoplasma exploits a central cost-benefit tradeoff in immunity: the need to escalate inflammation for pathogen clearance vs. the need to limit inflammation-induced bystander damage. What are the consequences of sustained inflammation on host biology? Many studies have focused on aspects of the immune response that directly target Toxoplasma growth and survival, commonly referred to as "resistance mechanisms." However, it is becoming clear that a parallel arm of the immune response has evolved to mitigate damage caused by the parasite directly (for example, egress-induced cell death) or bystander damage due to the inflammatory response (for example, reactive nitrogen species, degranulation). These so-called "disease tolerance" mechanisms promote tissue function and host survival without directly targeting the pathogen. Here we review changes to host metabolism, tissue structure, and immune function that point to disease tolerance mechanisms during Toxoplasma infection. We explore the impact tolerance programs have on the health of the host and parasite biolog

Tagged: chronic infection, gondii tachyzoites, ifn-gamma, immune-response, immunity, inferon gamma, innate, intracellural pathogen, natural-killer-cellsregulatory t- cells, oral infection, Parasite, resistancecachexia, small. intestine, tolerance, Toxoplasma gondii

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