The presence of particular group of bacteria in water bodies indicates contamination &identify the name
Answers
There is a huge number of bacteria with enough potential to contaminate a water body, here I'm mentioning some.
Aeromonas hydrophila- causes huge casualty to the animals living inside the water body(rot in several parts of fish-body)
Campylobacter coli & Campylobacter jejuni- these 2 cause campylobacteriosis to human. Actually not only these 2 but many other species of this particular genus also cause health hazards to human.
Salmonella enterica- salmonellosis is a disease caused by this and it affects the intestinal tract.
Shigella sonnei & Vibrio cholerae are some common examples.
The presence of E Coli bacteria and Fecal Coliform bacteria when found in water, it is said that the water is contaminated and not suitable to use.
They can cause diarrhea, stomach upset, abdominal pain and many other diseases.
People with weak immune system get attacked quickly destroy their immune system.