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Volume 14, Number 1—January 2008


Cryptosporidiosis and Filtration of Water from Loch Lomond, Scotland

Kevin G.J. Pollock*Comments to Author , David Young†, Huw V. Smith‡, and Colin N. Ramsay*
Author affiliations: *Health Protection Scotland, Glasgow, Scotland, UK; †University of Strathclyde, Glasgow, Scotland, UK; ‡Scottish Parasite Diagnostic Laboratory, Glasgow, Scotland, UK;

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Table 4

Distribution of cases by drinking water source before and after the introduction of filtration at Loch Lomond, Scotland

Relation to enhanced water filtration† Water source, no. (%)*
Loch Lomond Other All
Before 341 (222) 727 (846) 1,068
After 171 (290) 1,227 (1,108) 1,398
Both 512 1,954 2,466

*Numbers in parentheses are cases expected under the null hypothesis (i.e., no association between water supply and filtration).
†Coagulation and rapid gravity filtration, introduced in November 1999.

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