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Endemic giardiasis and municipal water supply.

Authors
  • Fraser, G G
  • Cooke, K R
Type
Published Article
Journal
American journal of public health
Publication Date
Jun 01, 1991
Volume
81
Issue
6
Pages
760–762
Identifiers
PMID: 2029049
Source
Medline
License
Unknown

Abstract

To test the hypothesis that endemic giardiasis may be transmitted by unfiltered municipal water supplies, the incidence of laboratory-confirmed giardiasis was studied in a natural experiment due to the arrangement of the public water supply of Dunedin, New Zealand. The incidence rate ratio was 3.3 (90% CI = 1.1, 10.1) for the population receiving unfiltered (microstrained) water relative to that using sand filtered water. In a parallel case-control study of incident cases, the odds ratio for giardiasis and unfiltered (microstrained) water supply was 1.8 (90% CI = 0.5, 6.9).

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