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

被引:30
|
作者
Clasen, Thomas
Saeed, Tanveer F.
Boisson, Sophie
Edmondson, Paul
Shipin, Oleg
机构
[1] Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Dis, London WC1E 7HT, England
[2] Asian Inst Technol, Sch Environm Resources & Dev, Bangkok 10501, Thailand
[3] Int Hlth Res Assoc, Milwaukee, WI USA
[4] Medentech, Wexford, Ireland
来源
AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE | 2007年 / 76卷 / 01期
关键词
D O I
10.4269/ajtmh.2007.76.187
中图分类号
R1 [预防医学、卫生学];
学科分类号
1004 ; 120402 ;
摘要
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.
引用
收藏
页码:187 / 192
页数:6
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