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Shapiro, Karen; Bahia-Oliveira, Lillian; Dixon, Brent; Dumètre, Aurélien; de Wit, Luz A.; VanWormer, Elizabeth; Villena, Isabelle
Food and waterborne parasitology, 06/2019, Volume: 15Journal Article
Toxoplasma gondii is a zoonotic protozoan parasite that can cause morbidity and mortality in humans, domestic animals, and terrestrial and aquatic wildlife. The environmentally robust oocyst stage of T. gondii is fundamentally critical to the parasite's success, both in terms of its worldwide distribution as well as the extensive range of infected intermediate hosts. Despite the limited definitive host species (domestic and wild felids), infections have been reported on every continent, and in terrestrial as well as aquatic environments. The remarkable resistance of the oocyst wall enables dissemination of T. gondii through watersheds and ecosystems, and long-term persistence in diverse foods such as shellfish and fresh produce. Here, we review the key attributes of oocyst biophysical properties that confer their ability to disseminate and survive in the environment, as well as the epidemiological dynamics of oocyst sources including domestic and wild felids. This manuscript further provides a comprehensive review of the pathways by which T. gondii oocysts can infect animals and people through the environment, including in contaminated foods, water or soil. We conclude by identifying critical control points for reducing risk of exposure to oocysts as well as opportunities for future synergies and new directions for research aimed at reducing the burden of oocyst-borne toxoplasmosis in humans, domestic animals, and wildlife. •Oocyst ingestion constitutes a significant proportion of T. gondii infections.•Oocyst attributes facilitate T. gondii transmission in terrestrial and aquatic habitats.•Oocysts are persistent and prevalent in water, soil and foods.•Mitigating oocyst-borne infections requires transdisciplinary international efforts.
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