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Related to cryptosporidium: Cryptosporidium parvum


cryptosporidium (krĭpˌtōspərĭdˈēəm), genus of protozoans having at least four species; they are waterborne parasites that cause the disease cryptosporidiosis. One of the species appears to be responsible for most of the illnesses. Symptoms of the disease are vomiting, diarrhea, abdominal cramps, and fever usually lasting one to two weeks. In immunosuppressed individuals, such as people with AIDS, the disease can be fatal. Nitazoxanide is an effective treatment in some immunosuppressed individuals.

The usual sources of cryptosporidial contamination of drinking water are human sewage (e.g., sewage system overflows) and runoff carrying animal waste (e.g., from dairy farms). Although coagulation-sedimentation and filtration reduce the levels of cryptosporidium in water supplies, they do not eliminate it. Chlorination has no effect on the organism, which protects itself in the form of an oocyst, a tiny encapsulated egglike structure, when not in the intestine of an animal or human, but ozone disinfection has been more successful. Cryptosporidiosis affected more that 400,000 people and caused over 60 deaths in Milwaukee in 1993 when the parasites contaminated the public water system. Smaller outbreaks have occurred in other states.

See also water pollution.

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References in periodicals archive ?
Cryptosporidium is the most common enteric zoonotic parasite, infecting humans and a wide range of domestic and wild animals, including reptiles, birds and fish (Bamaiyi et al., 2016).
In a statement issued yesterday, a spokesman said: "Our testing procedures flagged some early warnings for cryptosporidium.
The researchers found that 58 percent of the 363 outbreaks with confirmed infectious etiology were caused by Cryptosporidium, 16 percent by Legionella, and 13 percent by Pseudomonas.
Among these, 363 (94%) were caused by pathogens (including four caused by both Cryptosporidium and Giardia) and resulted in at least 24,453 cases.
The Tri-Combo Parasite Screen test is an enzyme immunoassay for the simultaneous qualitative detection of Giardia spp., Cryptosporidium spp., and/or E.
The major parasites implicated are Giardia lamblia and the emerging spore forming protozoa viz Cryptosporidium parvum and C.