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American Journal of Public Health, Vol. 81, Issue 6 760-762, Copyright © 1991 by American Public Health Association

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Endemic giardiasis and municipal water supply.

G G Fraser and K R Cooke

Public Health and Primary Care Programs, Otago Area Health Board, Dunedin, New Zealand.

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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Copyright © 1991 by the American Public Health Association