Abstract/Details

The evidence for groundwater as a source of enteric illness in developing countries: A systematic review of the literature


2011 2011

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Abstract (summary)

Groundwater constitutes approximately 30% of freshwater globally and serves as a source of drinking water in many regions. Groundwater sources are subject to contamination with human pathogens (viruses, bacteria and protozoa) from a variety of sources that can cause diarrhea and contribute to the devastating global burden of this disease. To attempt to describe the extent of this public health concern in developing countries, a systematic review of the evidence for groundwater microbially-contaminated at its source as risk factor for enteric illness under endemic (non-outbreak) conditions in these countries was conducted. Epidemiologic studies published in English language journals between January 2000 and January 2011, and meeting certain other criteria, were selected, resulting in eleven studies reviewed. Data were extracted on microbes detected (and their concentrations if reported) and on associations measured between microbial quality of, or consumption of, groundwater and enteric illness; other relevant findings are also reported. In groundwater samples, several studies found bacterial indicators of fecal contamination (total coliforms, fecal coliforms, fecal streptococci, enterococci and E. coli), all in a wide range of concentrations. Rotavirus and a number of enteropathogenic bacteria and parasites were found in stool samples from study subjects who had consumed groundwater, but no concentrations were reported. Consumption of groundwater was associated with increased risk of diarrhea, with odds ratios ranging from 1.9 to 6.1. However, limitations of the selected studies, especially potential confounding factors, limited the conclusions that could be drawn from them. These results support the contention that microbial contamination of groundwater reservoirs—including with human enteropathogens and from a variety of sources—is a reality in developing countries. While microbially-contaminated groundwaters pose risk for diarrhea, other factors are also important, including water treatment, water storage practices, consumption of other water sources, water quantity and access to it, sanitation and hygiene, housing conditions, and socio-economic status. Further understanding of the interrelationships between, and the relative contributions to disease risk of, the various sources of microbial contamination of groundwater can guide the allocation of resources to interventions with the greatest public health benefit. Several recommendations for future research, and for practitioners and policymakers, are presented.

Indexing (details)


Subject
Environmental Health;
Public health;
Epidemiology
Classification
0470: Environmental Health
0573: Public health
0766: Epidemiology
Identifier / keyword
Health and environmental sciences; Developing countries; Diarrhea; Enteric illness; Groundwater; Review
Title
The evidence for groundwater as a source of enteric illness in developing countries: A systematic review of the literature
Author
Perez, Beatriz Maria
Number of pages
50
Publication year
2011
Degree date
2011
School code
0219
Source
MAI 50/02M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124955100
Advisor
DuPont, Herbert L.
Committee member
Kelder, Steven H.
University/institution
The University of Texas School of Public Health
Department
Epidemiology & Disease Control
University location
United States -- Texas
Degree
M.P.H.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1501004
ProQuest document ID
902597256
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/902597256
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