Cryptosporidium oocysts in a water supply associated with a cryptosporidiosis outbreak

被引:60
作者
Howe, AD
Forster, S
Morton, S
Marshall, R
Osborn, KS
Wright, P
Hunter, PR [1 ]
机构
[1] Univ E Anglia, Sch Med Hlth Poicy & Practice, Norwich NR4 7TJ, Norfolk, England
[2] Publ Hlth Lab, Preston, Lancs, England
[3] United Utilities Water PLC, Warrington, Cheshire, England
[4] E Lancashire Hlth Author, Nelson, Lancs, England
关键词
D O I
10.3201/eid0806.010271
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
An outbreak of cryptosporidiosis occurred in and around Clitheroe, Lancashire, in northwest England, during March 2000. Fifty-eight cases of diarrhea with Cryptosporidium identified in stool specimens were reported. Cryptosporidium oocysts were identified in samples from the water treatment works as well as domestic taps. Descriptive epidemiology suggested that drinking unboiled tap water in a single water zone was the common factor linking cases. Environmental investigation suggested that contamination with animal feces was the likely source of the outbreak, This outbreak was unusual in that hydrodynamic modeling was used to give a good estimate of the peak oocyst count at the time of the contamination incident. The oocysts' persistence in the water distribution system after switching to another water source was also unusual. This persistence may have been due to oocysts being entrapped within biofilm. Despite the continued presence of oocysts, epidemiologic evidence suggested that no one became ill after the water source was changed.
引用
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页码:619 / 624
页数:6
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