Cryptosporidiosis Epidemiology

Cryptosporidiosis has been recognized as a human disease since the 1970s, with increasing importance in the 1980s and 1990s because of its relationship with HIV/ AIDS. Cryptosporidium accounts for 2.2% and 6.1% of diarrhea cases in immunocompetent people in developed and developing countries, respectively.35 These percentages increase to 7% and 12% in children in developed and developing countries, respectively, and to 14% and 24% in immunocompromised persons in developed and

developing countries, respectively.

Infection is spread person-to-person, usually via the fecal-oral route; by animals, particularly cattle and sheep; and through the environment, especially water. People at increased risk of contracting cryptosporidiosis include household and family contacts and sexual partners of someone with the disease, health care workers, daycare workers, users of public swimming areas, and people traveling to regions of high en-

demicity.

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