Sporadic cryptosporidiosis decline after membrane filtration of public water supplies, England, 1996-2002.

Little difference was made by modeling the intervals for commissioning and postcommissioning of membrane filtration separately, and no significant difference was seen between these rate estimates when this modeling was done (p = 0.35) Discussion Consumption of cold unboiled tap water from public drinking water supplies was shown to be a leading independent risk factor for sporadic cryptosporidiosis with a highly significant increase in risk with the usual volume drunk each day ( Table 3 ).

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