Volume 8, Number 6—June 2002
Research
Cryptosporidium Oocysts in a Water Supply Associated with a Cryptosporidiosis Outbreak
Andrew D. Howe*, Sue Forster*, Stephen Morton*, Roberta Marshall*, Keith S. Osborn†, Peter Wright‡, and Paul R. Hunter§
Table 1
Age-specific attack rates for cryptosporidiosis in residents of water zone 97, Clitheroe, March 2000
| Age group | Cases (n=51) | Population | Rate/10,000 | 95% confidence interval |
|---|---|---|---|---|
| <4 | 26 | 945 | 275.1 | 170.8 to 379.4 |
| 5–14 | 9 | 2,283 | 39.4 | 13.7 to 65.1 |
| 15–44 | 12 | 6,822 | 17.6 | 7.6 to 27.5 |
| >45 | 4 | 7,202 | 5.6 | 0.1 to 11.0 |
| Total | 51 | 1,7252 | 29.6 | 21.5 to 37.7 |
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