Organisms other than coliform bacteria are not sought in the bacteriological examination of water because Bacteriological examination of water is testing of total number and type of bacteria present in water.
Firstly coliform bacteria are tested because they are the indicators that disease causing bacteria are present in water. They are the rod shaped gram-negative bacteria which do not produce spores.
Coliform are tested in aerobic and anaerobic conditions. Coliform itself do not cause any illness. They can be cultured easily and can be tested for the indication of pathogenic bacteria, viruses and protozoa.
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