(n) 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)
adj. 1. taking immediate advantage, often unethically, of any circumstance of possible benefit; practising opportunism. [ wns=1 ] Syn. -- opportunist, timeserving. [ WordNet 1.5 ]
2. (Med.) Causing disease only when the immune system of the host has been weakened, or other damage to the host provides special opportunity for invasion; -- of microorganisms or infectious diseases; as, opportunistic pathogens may infect a burn site; AIDS predisposes a patient to opportunistic infection. [ PJC ]
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