Quantitative microbial risk assessment of the risks of Cryptosporidium and Giardiasis from very small private water supplies

Hunter, Paul R. ORCID: https://orcid.org/0000-0002-5608-6144, Anderle de Sylor, Marianna, Risebro, Helen L., Nichols, Gordon L., Kay, David and Hartemann, Philippe (2011) Quantitative microbial risk assessment of the risks of Cryptosporidium and Giardiasis from very small private water supplies. Risk Analysis, 31 (2). pp. 228-236. ISSN 1539-6924

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Abstract

This article reports a quantitative microbial risk assessment of the risk of Giardia and Cryptosporidium in very small private water supplies. Both pathogens have been implicated in causing outbreaks of waterborne disease associated with such supplies, though the risk of endemic disease is not known. For exposure assessments, we used existing data to derive regression equations describing the relationships between the concentration of these pathogens and Escherichia coli in private water supplies. Pathogen concentrations were then estimated using national surveillance data of E. coli in private water supplies in England and France. The estimated risk of infection was very high with the median annual risk being of the order of 25–28% for Cryptosporidium and 0.4% to 0.7% for Giardia, though, in the poorer quality supplies the risk could be much higher. These risks are substantially greater than for public water supplies and well above the risk considered tolerable. The observation that observed infection rates are generally much lower may indicate increased immunity in people regularly consuming water from private supplies. However, this increased immunity is presumed to derive from increased disease risk in young children, the group most at risk from severe disease.

Item Type:	Article
Faculty \ School:	Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups:	Faculty of Medicine and Health Sciences > Research Groups > Epidemiology and Public Health Faculty of Medicine and Health Sciences > Research Groups > Public Health and Health Services Research (former - to 2023) Faculty of Medicine and Health Sciences > Research Centres > Population Health Faculty of Medicine and Health Sciences > Research Groups > Norwich Clinical Trials Unit
Depositing User:	Rhiannon Harvey
Date Deposited:	21 Jul 2011 09:10
Last Modified:	11 Jan 2024 01:20
URI:	https://ueaeprints.uea.ac.uk/id/eprint/34012
DOI:	10.1111/j.1539-6924.2010.01499.x

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