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Cryptosporidium Study

Case Control, Cohort, and Other Studies

Cryptosporidium Case-Control Study, 1999

In 1999, FoodNet conducted a case-control study to determine sources and risk factors for Cryptosporidium infection.  Objectives included estimating the burden of illness associated with Cryptosporidium infection and determining the proportion of laboratory-confirmed sporadic infections that could be attributed to consuming foods or water, or to contact with recreational water or farm animals. Risk factors identified included international travel, contact with cattle, contact with persons >2 to 11 years of age with diarrhea, and freshwater swimming.  Eating raw vegetables protected against infection. 

An electronic copy of the questionnaire and protocol is not currently available. Please use the contact information to the right to request a copy.


Roy SL, Delong SM, Stenzel SA, Shiferaw B, Roberts JM, Khalakdina A, Marcus R, Segler SD, Shah DD, Thomas S, Vugia DJ, Zansky SM, Dietz V, Beach MJ; Emerging Infections Program FoodNet Working Group. Risk factors for sporadic Cryptosporidiosis among immunocompetent persons in the United States from 1999 to 2001. J Clin Micro. 2004;42(7):2944-2951.

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