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Epidemiol Infect. 2009 Nov;137(11):1651-4. doi: 10.1017/S0950268809002696. Epub 2009 May 11.

Cryptosporidiosis from a community swimming pool: outbreak investigation and follow-up study.

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  • 1Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA. tboehmer@cdc.gov


Tri-County Health Department investigated an outbreak of cryptosporidiosis linked to a community swimming pool. A cohort study was conducted in 37 persons who were invited to the pool party; 12 (57%) of 21 attendees had primary cryptosporidiosis infection. Risk factors for illness included swimming, getting water in mouth, and swallowing water. The pool met chlorination guidelines and used UV light irradiation, a supplemental disinfection technology that inactivates Cryptosporidium. A follow-up survey of the cohort was completed 7-8 weeks after the pool party; four (25%) of 16 non-attendees had secondary cryptosporidiosis infection. The median duration of illness, including patients with recurring symptoms, was 26 days. Clinical response rate to nitazoxanide, a therapeutic agent, was 67%. This study is unique because it describes a cryptosporidiosis outbreak from a well-maintained community swimming pool using supplemental disinfection. It also reports information on disease burden and treatment response.

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