Cryptosporidiosis And Filtration Of Water From Loch Lomond, Scotland

Previous evidence has suggested an association between consumption of unfiltered water from Loch Lomond, Scotland, and cryptosporicliosis. Before November 1999, this water had been only microstrained and disinfected with chlorine; however, since that time, physical treatment of the water (coagulation, rapid gravity filtration) has been added. To determine risk factors, including drinking water, for cryptosporicliosis, we analyzed data on laboratory-confirmed cases of cryptosporicliosis collected from 1997 through 2003. We identified an association between the incidence of cryptosporicliosis and unfiltered drinking water supplied to the home. The association supports the view that adding a filtration system to minimally treated water can substantially reduce the number of confirmed cryptosporidiosis cases.