Definitions for opportunistic infection
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Princeton's WordNet
opportunistic infection(noun)
any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs)
Wiktionary
opportunistic infection(Noun)
Any infection that causes disease and occurs only when the host's immune system is impaired.
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"opportunistic infection." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/opportunistic infection>.

