Definition of Opportunistic condition

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Opportunistic condition: A condition that occurs especially or exclusively in persons with a weak immune system due, for example, to AIDS, cancer or immunosuppressive drugs, such as corticosteroids or chemotherapy. An opportunistic condition may be an infection, such as toxoplasmosis or cytomegalovirus (CMV), or a tumor, such as Kaposi's sarcoma in AIDS. See also opportunistic infection, opportunistic microorganism.