Discussion
In potable water analysis Escherichia coli is used as indicator because E. coli is :
Answer: C
E. coli is used as the indicator because it is a common inhabitant of the human intestine.
An indicator organism signals faecal contamination. E. coli lives in large numbers in the intestines of humans and warm-blooded animals and is shed in faeces, but it does not normally multiply in clean water. Finding it in a drinking water sample therefore shows that faecal matter, and possibly the pathogens that travel with it, has entered the water.
Most strains are not pathogens, so it is not used because it is an enteropathogen or an opportunistic pathogen. It is easy to culture, which is convenient, but ease of detection alone would not make an organism an indicator of faecal pollution.
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