[op-er-too-nis-tik, -tyoo-]
adhering to a policy of opportunism; practicing opportunism.
(of a microorganism) causing disease only under certain conditions, as when a person's immune system is impaired.
(of a disease or infection) caused by such an organism: Pneumocystis pneumonia is an opportunistic disease that often strikes victims of AIDS.

1890–95; opportunist + -ic

opportunistically, adverb
unopportunistic, adjective

opportune, opportunistic (see synonym study at opportune).
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World English Dictionary
opportunistic (ˌɒpətjʊˈnɪstɪk)
1.  of or characterized by opportunism
2.  med (of an infection) caused by any microorganism that is harmless to a healthy person but debilitates a person whose immune system has been weakened by disease or drug treatment

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American Heritage
Medical Dictionary

opportunistic op·por·tun·is·tic (ŏp'ər-tōō-nĭs'tĭk, -tyōō-)

  1. Of or relating to an organism capable of causing disease only in a host whose resistance is lowered.

  2. Of or relating to a disease caused by an opportunistic organism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
As the cell count drops, the immune system begins to fail and opportunistic
  infections such as tuberculosis take hold.
Today's threats come from reckless tourists, opportunistic developers, an
  indifferent public and the ravages of nature.
The grays are opportunistic feeders, they say, which makes them better
  candidates to adapt to the changing climate.
It's a free country people have the freedom to be cold, opportunistic and
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