Luby S, Islam Md S, Johnston R
Programme on Infectious Diseases and Vaccine Sciences, ICDDR, B Centre for Health and Population Research, Mohakhali, Dhaka, Bangladesh.
J Appl Microbiol. 2006 May;100(5):1154-8. doi: 10.1111/j.1365-2672.2006.02940.x.
To evaluate the water quality of recently flooded tube wells in Bangladesh and the effect of spot chlorination on improving bacteriological quality.
The study team identified and tested water samples from 127 tube wells that were flooded within the preceding 4 weeks. Twenty-six of the tube wells with the highest concentration of thermotolerant coliform bacteria were randomly assigned to spot chlorination vs control. On initial screening, water samples from 56 recently inundated tube wells (44%) were contaminated with thermotolerant coliforms. Among the 13 wells randomized to chlorination, there was no change in the proportion of water samples that had no detectable thermotolerant coliform bacteria immediately before chlorine treatment (n = 4, 23%) and 60 min following chlorine treatment (n = 4, 23%). Similarly, there was no difference in the proportion of water samples that had no detectable thermotolerant coliforms between chlorine spot treated and control tube wells 7-18 days later (31 vs 23%P = 0.66).
Spot chlorine treatment of inundated tube wells in Bangladesh three to 6 weeks after the flooding did not improve drinking water quality.
Unless modified methods improve effectiveness, resources should not be spent promoting spot chlorination of flooded tube wells.
评估孟加拉国近期被洪水淹没的管井的水质，以及现场氯化处理对改善细菌学质量的效果。
研究团队识别并检测了来自127口在前4周内被洪水淹没的管井的水样。将26口耐热大肠菌群浓度最高的管井随机分配至现场氯化处理组与对照组。初步筛查时，56口近期被淹没的管井（44%）的水样被耐热大肠菌群污染。在随机分配至氯化处理的13口井中，在氯处理前（n = 4，23%）和氯处理后60分钟（n = 4，23%）无可检测耐热大肠菌群的水样比例没有变化。同样，在7 - 18天后，现场氯化处理的管井和对照管井中无可检测耐热大肠菌群的水样比例也没有差异（31%对23%，P = 0.66）。
在洪水发生三至六周后对孟加拉国被淹没的管井进行现场氯化处理并不能改善饮用水质量。
除非改进方法能提高效果，否则不应投入资源推广对被洪水淹没的管井进行现场氯化处理。
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