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Medical Definition of Toxoplasma gondii
1. An abundant, widespread sporozoan species (family Toxoplasmatidae) that is an intracellular, nonhost-specific parasite in a great variety of vertebrates. It develops its sexual cycle, leading to oocyst production, exclusively in cats and other felids; proliferative stages (tachyzoites) and tissue cysts (containing bradyzoites) develop in a wide variety of animal species that acquire the infection from ingestion of oocysts, tissue cysts from infected meat, or by transplacental migration, leading to infection in utero. Origin: G. Toxon, bow or arc, + plasma, anything formed (05 Mar 2000)