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Contaminated drinking water in one town manifesting as an outbreak of cryptosporidiosis in another

  • J. M. McANULTY (a1) (a2), W. E. KEENE (a1), D. LELAND (a1), F. HOESLY (a1), B. HINDS (a3), G. STEVENS (a3) and D. W. FLEMING (a1)...
    • Published online: 01 November 2000
Abstract

In early 1992 we identified an outbreak of cryptosporidiosis in Oregon and sought to identify and control its source. We used a series of studies to identify risk factors for illness : (i) a case-control study among employees of a long-term-care facility (LTCF); (ii) a matched case-control study of the general community; (iii) a cohort study of wedding attendees; and (iv) a cross-sectional survey of the general community. Drinking Talent water was associated with illness in the LTCF (OR = 22·7, 95% CI = 2·7–1009·0), and in the community (matched OR = 9·5, 95% CI 2·3–84·1). Drinking Talent water was associated with illness only among non-Talent residents who attended the wedding (P < 0·001) and in the community (RR = 6·5, 95% CI 3·3–12·9). The outbreak was caused by contaminated municipal water from Talent in the absence of a discernible outbreak among Talent residents, suggesting persons exposed to contaminated water may develop immunity to cryptosporidiosis.

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Corresponding author
Author for correspondence: Communicable Diseases Surveillance and Control Unit, New South Wales Health Department, Locked Mail Bag 961, North Sydney, New South Wales, Australia.
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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
  • URL: /core/journals/epidemiology-and-infection
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