1921
Volume 97, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Abstract.

Microbiological water quality is usually assessed by the identification of (), a fecal indicator. The hydrogen sulfide (HS) test is an inexpensive, easy-to-use, and portable alternative field-based water quality test. Our study evaluated the HS test’s effectiveness as a water quality indicator for diarrhea risk. Field workers collected stored drinking water samples for HS analysis and detection of by membrane filtration and measured caregiver-reported diarrhea among children < 5 years in the same households 1 month later. We assessed the association between the HS test (incubated for 24 hours and 48 hours) and diarrhea prevalence, with 2-day and 7-day symptom recall periods ( = 1,348). We determined the sensitivity, specificity, and positive and negative predictive value (PPV, NPV) of the HS test compared with ( = 525). Controlling for potentially confounding covariates, HS-positive water (at 24 or 48 hours) was not associated with 2-day diarrhea prevalence (24-hour prevalence ratio [PR] = 1.03, 95% confidence interval [CI]: 0.63–1.69; 48-hour PR = 0.89, 95% CI: 0.58–1.38) or 7-day diarrhea prevalence (24-hour PR = 1.17, 95% CI: 0.76–1.78; 48-hour PR = 1.21, 95% CI: 0.81–1.80). The sensitivity, PPV, and NPV of the HS test was significantly higher when the HS test was incubated for 48 versus 24 hours whereas specificity showed the opposite trend. HS test sensitivity, PPV, and NPV increased with increasing levels, consistent with previous evidence that the HS test is a useful water quality tool in high-contamination settings. However, our results suggest that the HS test is not an effective indicator for waterborne diarrhea.

[open-access] This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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2017-12-06
2018-09-19
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  • Received : 17 May 2017
  • Accepted : 25 Jul 2017

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