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A non pathogenic organism cause infection in host when the host's immune system is down.It is called as opportunistic pathogen.That infection is known as opportunistic infection.

Example for opportunistic pathogen:

Candida albicans, Mycobacterium avium-intracellulare, cytomegalovirus (CMV) ---- Pathogen to HIV positive persons.

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Q: What term describes a non pathogenic organism that becomes pathogenic?
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