Between 1983 and 1986 an investigation of environmental sanitation, especially of bacterial contamination in drinking water was carried out on three occassions in a rural region in northeast Thailand.
After experimental research, it was found that every well for drinking water in the village was contamined with coli form bacilli.
Aeromonas hydrophila and non-01 Vibrio cholelae existed in the water. Contamination of pumped water by salt was so remarkable that people did not drink such water. Even drinking water from wells, which had a low salt concentration(<25mg/l), were contaminated by Vibrio fluvialis and Vibrio alginolyticus, which prefer marine circumstances.
V. fluvialis, which seems to be a marine bacteria, also had the ability to survive and grow under almost fresh water conditions.
During the third survey, 14 out of 18 Japanese who participated in this project, suffered from diarrhea. The feces of 6 of them contained S. sonnei and A. hydrophila was identified in two others, However, the source of the contamination was not yet determined.
Prevention of bacterial diarrhea is still an important object of hygiene in the rural areas in northeast Thailand.
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