Global assessment of exposure to faecal contamination through drinking water based on a systematic review

Bain, Robert, Cronk, Ryan, Hossain, Rifat, Bonjour, Sophie, Onda, Kyle, Wright, Jim, Yang, Hong, Slaymaker, Tom, Hunter, Paul ORCID:, Prüss-Ustün, Annette and Bartram, Jamie (2014) Global assessment of exposure to faecal contamination through drinking water based on a systematic review. Tropical Medicine & International Health, 19 (8). pp. 917-927. ISSN 1360-2276

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Objectives: To estimate exposure to faecal contamination through drinking water as indicated by levels of Escherichia coli (E. coli) or thermotolerant coliform (TTC) in water sources. Methods: We estimated coverage of different types of drinking water source based on household surveys and censuses using multilevel modelling. Coverage data were combined with water quality studies that assessed E. coli or TTC including those identified by a systematic review (n = 345). Predictive models for the presence and level of contamination of drinking water sources were developed using random effects logistic regression and selected covariates. We assessed sensitivity of estimated exposure to study quality, indicator bacteria and separately considered nationally randomised surveys. Results: We estimate that 1.8 billion people globally use a source of drinking water which suffers from faecal contamination, of these 1.1 billion drink water that is of at least 'moderate' risk (>10 E. coli or TTC per 100 ml). Data from nationally randomised studies suggest that 10% of improved sources may be 'high' risk, containing at least 100 E. coli or TTC per 100 ml. Drinking water is found to be more often contaminated in rural areas (41%, CI: 31%-51%) than in urban areas (12%, CI: 8-18%), and contamination is most prevalent in Africa (53%, CI: 42%-63%) and South-East Asia (35%, CI: 24%-45%). Estimates were not sensitive to the exclusion of low quality studies or restriction to studies reporting E. coli. Conclusions: Microbial contamination is widespread and affects all water source types, including piped supplies. Global burden of disease estimates may have substantially understated the disease burden associated with inadequate water services.

Item Type: Article
Uncontrolled Keywords: water safety,e. coli,thermotolerant coliform,disease burden,drinking water
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: Pure Connector
Date Deposited: 21 Jan 2015 12:36
Last Modified: 20 Oct 2022 22:33
DOI: 10.1111/tmi.12334

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