A member asked:

Why do some bacteria make us ill while others help us stay healthy?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Bacteria.: Opportunistic infections occur when pathogens that usually don't make us sick - do so because our immune system is not working well. Some bacteria are essential to good health such as many gut bacterial. On the other hand - there are some bacteria that our bodies are not equipped to deal with.

Answered 1/3/2016

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