title: Ultrastructure of excystment of Toxoplasma gondii oocysts.
abstract: The excystation of sporozoites from intact Toxoplasma gondii oocysts or mechanically released sporocysts was studied by light and electron microscopy. Both intact oocysts and free sporocysts excysted in 5% bovine bile in 0.9% NaCl solution after 30-60 min incubation at 37C. Sporozoites were first activated in either intact sporocysts or oocysts within 2-12 min of incubation in bile. Sporozoites escaped from sporocysts through 4 plate-like sutures in the sporocyst wall, and from the oocyst as the oocyst wall ruptured at one or more points.
mesh_terms: D000818:Animals; D001647:Bile Acids and Salts / Q000494:pharmacology; D002415:Cats; D002473:Cell Wall / Q000648:ultrastructure; D005243:Feces / Q000469:parasitology; D009940:Organoids / Q000648:ultrastructure; D014122:Toxoplasma / Q000502:physiology / Q000648:ultrastructure*; D014124:Toxoplasmosis, Animal / Q000469:parasitology*
chemical_list: D001647:Bile Acids and Salts