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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§Comments to Author 
Author affiliations: *East Lancashire Health Authority, Nelson, United Kingdom; †United Utilities Water PLC, Warrington, United Kingdom; ‡Public Health Laboratory, Preston, United Kingdom; §University of East Anglia, Norwich, United Kingdom

Main Article

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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