(Cryptosporidium Antigen Test) (Product Code: SC-0524-10). The Cryptosporidium Antigen Rapid Test Cassette (Feces) is a rapid chromatographic immunoassay for the qualitative detection of Cryptosporidium Antigens in human feces. Cryptosporidiosis is a diarrhoeal disease caused by microscopic parasites of the genus Cryptosporidium. Once an animal or person is infected, the parasite lives in the intestine and passes in the stool. The parasite is protected by an outer shell that allows it to survive outside the body for long periods of time and makes it very resistant to chlorine-based disinfectants.