Journal Article

<i>Escherichia coli</i> O157:H7 Outbreak Associated with an Improperly Chlorinated Swimming Pool

Michael S. Friedman, Thierry Roels, Jane E. Koehler, Lynne Feldman, William F. Bibb and Paul Blake

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 29, issue 2, pages 298-303
Published in print July 1999 | ISSN: 1058-4838
Published online July 1999 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/520204
Escherichia coli O157:H7 Outbreak Associated with an Improperly Chlorinated Swimming Pool

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A cluster of gastrointestinal illnesses, including one case of hemolytic-uremic syndrome and one culture-confirmed Escherichia coli O157:H7 infection, followed a trailer park pool party. We interviewed a cohort of party attendees and park residents. A primary case was defined as the first gastrointestinal illness within a household between 5 July and 20 July in which the titer of IgG antibody to E. coli O157 (if determined) was elevated. Of 51 party attendees and trailer park residents, 18 developed a gastrointestinal illness, including 10 who met the definition of a primary case. Swimming in the pool significantly increased the risk of primary illness (relative risk = 6.3; 95% confidence interval = 1.8 –18.9). No other exposure was significantly associated with primary illness, after pool exposure was controlled for. The implicated pool had little to no chlorine added during the period of 4–10 July. This outbreak provides new evidence of the importance of proper pool maintenance in controlling the spread of E. coli O157:H7.

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Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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