Question

You perform your water quality assessment and isolate several Escherichia coli from your EC broth. Would you expect some, all, or none of these E. coli to be pathogenic? Why?

Answer 1

yes some of these E.Coli are pathogenic there are some pathogenic strains of E.coli like O157: H7, O26, O121, etc these strains can produce lethal toxin and can cause diarrhea, food poisoning, etc.

normally E.coli are symbiotically present in the human intestine through fecal matter this E.coli enter into water bodies and contaminate the water body. E. coli is a better indicator used to analyze the fecal contamination in water.

EC broth is a selective broth use to select E.coli