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Multi-pathogen waterborne disease outbreak associated with a dinner cruise on Lake Michigan

  • F. SERDAREVIC (a1) (a2), R. C. JONES (a1), K. N. WEAVER (a1), S. R. BLACK (a1), K. A. RITGER (a1), F. GUICHARD (a3), P. DOMBROSKI (a4), B. P. EMANUEL (a5), L. MILLER (a1) and S. I. GERBER (a6)...
Summary
SUMMARY

We report an outbreak associated with a dinner cruise on Lake Michigan. This took place on the same day as heavy rainfall, which resulted in 42·4 billion liters of rainwater and storm runoff containing highly diluted sewage being released into the lake. Of 72 cruise participants, 41 (57%) reported gastroenteritis. Stool specimens were positive for Shigella sonnei (n=3), Giardia (n=3), and Cryptosporidium (n=2). Ice consumption was associated with illness (risk ratio 2·2, P=0·011). S. sonnei was isolated from a swab obtained from the one of the boat's ice bins. Environmental inspection revealed conditions and equipment that could have contributed to lake water contaminating the hose used to load potable water onto the boat. Knowledge of water holding and distribution systems on boats, and of potential risks associated with flooding and the release of diluted sewage into large bodies of water, is crucial for public health guidance regarding recreational cruises.

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Corresponding author
*Author for correspondence: S. I. Gerber, M.D., Cook County Department of Public Health, 15900 S. Cicero Avenue, Bldg. E-3rd Fl., Oak Forest, IL 60452, USA. (Email: sgerber@ccdph.net)
References
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1.Rooney RM, et al. A review of outbreaks of waterborne disease associated with ships: evidence for risk management. Public Health Reports 2004; 119: 435442.
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4.Centers for Disease Control and Prevention.Surveillance for waterborne disease and outbreaks associated with drinking water and water not intended for drinking – United States, 2005–2006. Morbidity and Mortality Weekly Report (Surveillance Summaries) 2008; 57 (No. SS-9).
5.Illinois State Climatologist Office. Heavy Rains in Illinois, September 2008 (http://www.isws.illinois.edu/atmos/statecli/2008/September2008/tropical.htm). Accessed 26 March 2011.
6.Metropolitan Water Reclamation District of Greater Chicago. District affirms lake discharge numbers: correct containment/management figures. Press release 30 September 2008.
7.Metropolitan Water Reclamation District of Greater Chicago. District operations open all systems to stem flooding: 60 billion gallons of water dumped on region before noon. Press release 13 September 2008.
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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
  • URL: /core/journals/epidemiology-and-infection
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