A genus of coccidia (family Eimeriidae, class Sporozoea), with species parasitic chiefly in mammals; the ripe oocysts contain two sporocysts, each of which contains four sporozoites. This genus is now known to be closely related to Toxoplasma and Sarcocystis, with a similar sexual phase in the life cycle and a similar apical complex.
[iso- + G. sporos, seed]
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Examples: glitazone, GI cocktail, etc.