Volume 14, Number 1—January 2008
Research
Cryptosporidiosis and Filtration of Water from Loch Lomond, Scotland
Kevin G.J. Pollock*
, David Young†, Huw V. Smith‡, and Colin N. Ramsay*
, David Young†, Huw V. Smith‡, and Colin N. Ramsay*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.
