Question

what is a colliform bacteria what does its presence indicate

Answer 1

The coliform bacteria live in the intestines of warm-blooded animals, including humans . These are not themselves necessarily harmful but are considered indicators of water contamination. Their presence in water suggests fecal contamination, which can contain pathogens, including harmful strains of  cholera, salmonella, E. coli and hepatitis. Thus coliform bacteria are the group of microorganisms that as indicators of disease causing microbes in water.

Answer 2

colliform bacteria is a group of bacteria which are found in soil, water etc. and some of them are pathogenic but most of them are not as h armul as them

their presence indicates that some other harmful pathogens are also present in water bodies