food and nutrition


Municipal Water

Question: Are there any good ecoli case examples dealing with municipal water supply? Doing some reasearch on ecoli cases that started in municipal water supplies. Any help would be appreciated.

Answer: Pathogenic E coli is really more of a food-borne problem. That said, however, E coli is one of a class of bacteria known as "coliform bacteria" that serve as in indicator of fecal contamination of water. E coli is generally found only within the digestive tracts of various animals. Thus, any time you find E coli (or other coliform bacteria) in a water source, it can be assumed that some type of fecal contamination of the water has occured. While the E coli itself usually isn't going to make you sick (some strains of E coli can, but not most), other water-borne pathogens spread from fecal contamination of water supply like Cholera, Typhoid, or Dysentary can be life-threatening. When we find E coli or other coliforms in a water sample, we ASSUME that it's dangerous and take appropriate cautionary measures. In this way E coli and other coliforms serve as "indicator organisms" used by local environmental health jurisdictions to determine if a water supply is safe to drink, swim in, etc. I don't work in the water supply element of environmental health, so my knowledge is a little hazy. But this should give you a start. Try searching not only for E coli, but also for drinking and/or recreational water quality on the web.


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