Who are Coliforms?
They are heterogeneous group of bacterial species composed of following genera,
This group of organisms comes under the Family Enterobacteriaceae. Enterobacteriaceae can be divided into two categories termed as non coliforms and coliforms. Examples for non coliforms are Salmonella, Shigella, and Vibrio etc. Coliforms again can be subdivided into two categories such as total coliforms and fecal coliforms.
Escherichia coli is exclusively fecal in origin hence E.coli is comes under fecal Coliform group. Fecal coliforms are able to tolerate 44.50 C. And all other coliforms, Enterobacter, Klebsiella, Citrobacter and Aeromonas come under total coliforms because they are widely distributed in soils, vegetations and industrial waste.