Skip to main content
×
Home
    • Aa
    • Aa

Giardiasis outbreak at a camp after installation of a slow-sand filtration water-treatment system

  • A. E. KARON (a1) (a2), K. D. HANNI (a3), J. C. MOHLE-BOETANI (a1), R. A. BERETTI (a3), V. R. HILL (a4), M. ARROWOOD (a4), S. P. JOHNSTON (a4), L. XIAO (a4) and D. J. VUGIA (a1)...
Abstract
SUMMARY

In July and August 2007, a giardiasis outbreak affected attendees of a private recreational camp in California. Twenty-six persons had laboratory-confirmed giardiasis; another 24 had giardiasis-like illness with no stool test. A retrospective cohort study determined that showering was associated with illness (adjusted odds ratio 3·1, 95% confidence interval 1·1–9·3). Two days before the outbreak began, the camp had installed a slow-sand water filtration system that included unsterilized sand. Review of historical water-quality data identified substantially elevated total coliform and turbidity levels in sand-filtered spring water used for showering during the suspected exposure period. Unfiltered spring water tested at the same time had acceptable coliform and turbidity levels, implicating the filtration system as the most likely contamination source. To prevent waterborne illness, slow-sand water filtration systems should use sterilized sand, and slow-sand-filtered water should not be used for any purpose where inadvertent ingestion could occur until testing confirms its potability.

Copyright
Corresponding author
*Author for correspondence: Dr A. E. Karon, Bureau of Communicable Diseases and Emergency Response, Wisconsin Division of Public Health, 1 W. Wilson Street, Room 318, Madison, WI53701, USA. (Email: aekaron@gmail.com)
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

7.IM Sulaiman , Triosephosphate isomerase gene characterisation and potential zoonotic transmission of multispecies Giardia duodenalis. Emerging Infectious Diseases 2003; 9: 14441452.

9.M Beller , Outbreak of viral gastroenteritis due to a contaminated well. Journal of the American Medical Association 1997; 278: 563568.

11.GS Logsdon , Slow sand filtration for small water systems. Journal of Environmental Engineering and Science 2002; 1: 339348.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
  • URL: /core/journals/epidemiology-and-infection
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords: