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 2
Results of 10-L grab samples taken within distribution range of water works during investigationa of cryptosporidial outbreak, Clitheroe, March 16–April 6, 2001
| Date | Samples taken | Samples positive | Oocyst counts of positive samples/L | ||||
|---|---|---|---|---|---|---|---|
| 16 Mar | 3 | 1 | 0.5 | ||||
| 17 Mar | 6 | 5 | 0.1 | 0.2 | 0.1 | 0.2 | 0.1 |
| 18 Mar | 8 | 4 | 0.2 | 0.2 | 0.3 | 0.3 | |
| 19 Mar | 8 | 5 | 0.2 | 0.3 | 0.1 | 0.1 | 0.2 |
| 20 Mar | 9 | 5 | 0.1 | 0.2 | 0.9 | 0.5 | 0.1 |
| 21 Mar | 23 | 5 | 0.2 | 0.1 | 0.1 | 0.4 | 0.1 |
| 22 Mar | 16 | 4 | 0.1 | 0.1 | 0.1 | 0.1 | |
| 23 Mar | 15 | 2 | 0.1 | 0.2 | |||
| 24 Mar | 15 | 2 | 0.1 | 0.1 | |||
| 25 Mar | 12 | 2 | 0.1 | 0.1 | |||
| 26 Mar | 12 | 0 | |||||
| 27 Mar | 9 | 0 | |||||
| 28 Mar | 3 | 2 | 0.3 | 0.4 | |||
| 29 Mar | 3 | 0 | |||||
| 30 Mar | 6 | 3 | 0.1 | 0.2 | 0.4 | ||
| 31 Mar | 9 | 3 | 0.1 | 0.1 | 0.6 | ||
| 1 Apr | 7 | 1 | 0.1 | ||||
| 2 Apr | 7 | 1 | 0.1 | ||||
| 3 Apr | 6 | 2 | 0.1 | 0.1 | |||
| 4 Apr | 6 | 0 | |||||
| 5 Apr | 6 | 0 | |||||
| 6 Apr |
3 |
0 |
|||||
| a Total volume examined each day (in L) = 10 X number of samples taken. | |||||||
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