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Medical Definition of Isospora bigemina
1. A species that occurs in the small intestine of the dog, cat, fox, mink, and possibly other carnivores; the most pathogenic coccidium in dogs and cats, causing enteritis and diarrhoea; the oocysts are usually sporulated when passed in the faeces, but are indistinguishable from those of Toxoplasma gondii, so considerable question remains as to the status of these parasites. (05 Mar 2000)