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

  • T. K. BOEHMER (a1) (a2), N. B. ALDEN (a2), T. S. GHOSH (a2) and R. L. VOGT (a2)
  • DOI: http://dx.doi.org/10.1017/S0950268809002696
  • Published online: 11 May 2009
Abstract
SUMMARY

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.

Copyright
Corresponding author
*Author for correspondence: Dr T. K. Boehmer, Centers for Disease Control and Prevention, 4770 Buford Hwy NE, MS F-58, Atlanta, GA 30341, USA. (Email: tboehmer@cdc.gov)
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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
  • URL: /core/journals/epidemiology-and-infection
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