Outbreak of cryptosporidiosis associated with a disinfected groundwater supply

Bridgman, S. A., Robertson, R. M. P., Syed, Q., Speed, N., Andrews, N. and Hunter, P. R. ORCID: https://orcid.org/0000-0002-5608-6144 (1995) Outbreak of cryptosporidiosis associated with a disinfected groundwater supply. Epidemiology and Infection, 115 (3). pp. 555-566. ISSN 0950-2688

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In an outbreak of cryptosporidiosis in Warrington. a town in North-West England. 47 cases were recorded between November 1992 and February 1993. most within the first month. There was a strong statistical association between cases and residence in an area supplied from two groundwater sources. In a case-control study, a strong association between having drunk unboiled tap water from these sources, and a dose-response relationship were found. Oocysts were not detected in the water supply. During very heavy rainfall one source of water was found to drain surface water directly from a field containing livestock faeces, thereby bypassing natural sandstone filtration. Exceptionally heavy rainfall occurred at the probable time of infection. After withdrawal of the original water supply, the outbreak rapidly subsided. It was concluded that there was very strong evidence that this outbreak was waterborne. This, the second documented outbreak of cryptosporidiosis attributable to a groundwater supply, demonstrates that infection can be transmitted from a disinfected groundwater source despite apparently satisfactory treated water quality. We recommend that guidelines for protection of groundwater are implemented, raw groundwater should be routinely monitored for microbiological contamination, and the structure of all sources and waterworks should be assessed in risk surveys of water catchment areas.

Item Type: Article
Uncontrolled Keywords: sdg 6 - clean water and sanitation ,/dk/atira/pure/sustainabledevelopmentgoals/clean_water_and_sanitation
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Public Health and Health Services Research (former - to 2023)
Faculty of Medicine and Health Sciences > Research Groups > Epidemiology and Public Health
Faculty of Social Sciences > Research Centres > Water Security Research Centre
Faculty of Medicine and Health Sciences > Research Centres > Population Health
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Depositing User: LivePure Connector
Date Deposited: 01 Mar 2022 15:34
Last Modified: 19 Oct 2023 03:16
URI: https://ueaeprints.uea.ac.uk/id/eprint/83806
DOI: 10.1017/S0950268800058726

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