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Author Notes:

Address correspondence to Thomas Clasen, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK. E-mail: thomas.clasen@lshtm.ac.uk

Subject:

Research Funding:

Medentech, a manufacturer of NaDCC tablets, donated the tablets and placebos used in this trial and covered the cost of consumables used in the water analyses.

Household water treatment using sodium dichloroisocyanurate (NaDCC) tablets: a randomized, controlled trial to assess microbiological effectiveness in Bangladesh

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Journal Title:

American Journal of Tropical Medicine and Hygiene

Volume:

Volume 76, Number 1

Publisher:

, Pages 187-192

Type of Work:

Article | Final Publisher PDF

Abstract:

We assessed the microbiologic effectiveness of sodium dichloroisocyanurate (NaDCC) tablets used on a routine basis at the household level by a vulnerable population. In a 4-month trial in Dhaka, Bangladesh, one half of the 100 participating households received NaDCC tablets and instructions on how to use the same; the other one half received a placebo and the same instructions. Monthly samples of stored drinking water from intervention households were significantly lower in thermotolerant coliforms (TTCs) than those of control households (geometric mean, 2.8 [95% CI: 2.2, 3.6] versus 604.1 [95% CI: 463.2, 787.9]; P < 0.0001). While 61.7% (116/188) of samples from the intervention households met World Health Organization (WHO) guidelines for 0 TTCs in drinking water, none of the 191 samples from control households met such a benchmark. Residual free chlorine in water samples suggested that householders consistently used the intervention, but 11.7% of samples exceeded the WHO guideline value of 5.0 mg/L, underscoring the need to ensure that tablet dose and vessel size are compatible.

Copyright information:

© 2007 The American Society of Tropical Medicine

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