BIOL 4105 Chapter : Parasitology Unit 2
Document Summary
Isospora belli-pathogen: eimeria spp, cyclospora cayetanensis-pathogen, all direct, family cryptosporidiidae, cryptosporidium parvum- pathogen, all direct, family sarcocystidae, toxoplasma gondii-pathogen, sarcocystis spp, both indirect with vert. Intermediate host: eimeria tenella, cecal coccidiosis aka bloody cecum, chickens- morbidity and mortality are high, niche- ceca (epithelial cells) Ingestion of sporulated oocysts in feed or water: clinical disease, bloody diarrhea, host death is common outcome of infection, can"t treat in chickens, must prevent with coccidiostat drugs. Sporogony needs oxygen: diagnosis- oocysts in fecal smear, rx: septra (trimethoprim-sulfamethoxazole, cyclospora cayetanensis, fairly new-1990 usa, worldwide emerging , niche: small intestine, jejunum specifically, explosive, watery diarrhea. Persists for several weeks: self limiting, source of infection: contaminated food. Immunosuppressed (greatest risk: elderly- especially if debilitated. This makes them intracellular but they are not in the cytoplasm of the host cell. The entire gi tract has microvilli so it has been known to infect entire gi tract.
