Document Detail

Municipal waterborne giardiasis: an epidemilogic investigation. Beavers implicated as a possible reservoir.
MedLine Citation:
PMID:  7188724     Owner:  NLM     Status:  MEDLINE    
In March 1976, 128 persons in Camas, Washington, had laboratory-confirmed giardiasis. A questionnaire survey of 498 Camas residents revealed that 3.8% had clinical giardiasis, while none of 318 residents in a control town were ill. No associations between illness and sex, pet ownership, travel, time spent in wilderness areas, public gatherings, or food preference were found. Giardia cysts were recovered from raw water entering the city water treatment system via two streams and also from two storage reservoirs containing chlorinated and filtered stream water. Failure to remove Giardia cysts was attributed to the water plants' inadequate flocculation, coagulation, and sedimentation combined with deterioration of the filter media. Investigation of the watershed revealed no signs of human fecal contamination. Animal trapping in the watershed area yielded three beavers (Castor canadensis) infected with Giardia that were infective for specific pathogen-free beagle pups.
A C Dykes; D D Juranek; R A Lorenz; S Sinclair; W Jakubowski; R Davies
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Annals of internal medicine     Volume:  92     ISSN:  0003-4819     ISO Abbreviation:  Ann. Intern. Med.     Publication Date:  1980 Feb 
Date Detail:
Created Date:  1980-03-27     Completed Date:  1980-03-27     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0372351     Medline TA:  Ann Intern Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  165-70     Citation Subset:  AIM; IM    
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MeSH Terms
Animals, Wild / parasitology
Disease Outbreaks*
Disease Reservoirs
Giardiasis / epidemiology*,  transmission
Rodentia / parasitology
Water Supply*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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