Coliform bacteria are a Rod shaped Gram-negative non-spore forming and motile or non-motile bacteria which can ferment lactose with the production of acid and gas when incubated at 35–37°C.
some types of coliform bacteria serves as indicators and for that matter, helps prevent the occurance of some diseases.
The presence of some coliform bacteria in water signals the presence of feces or sewage waste. Feces and sewage wastes are usually the source of the disease-causing organisms. Helminths, such as roundworms and tapeworms, that cause chronic diarrhea.
Some microbes serves as indicators.
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