How can humans harbor many microorganisms on and inside their bodies w/o experie!

Question:

How can humans harbor many microorganisms on and inside their bodies w/o experiencing symptoms of infection?

Answers:

The microorganisms aren't harmful to us.... our bodies have evolved enough so that we have immunity to them.

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How can humans harbor many microorganisms on and inside their bodies w/o experie!

How can humans harbor many microorganisms on and inside their bodies w/o experiencing symptoms of infection?

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