Opportunistic Infection (OI) or Opportunistic Condition (OI)

An infection or cancer that occurs in persons with weak immune systems due to HIV, cancer, or immunosuppressive drugs such as corticosteroids or chemotherapy. Examples include Kaposi's Sarcoma (KS); Pneumocystis jiroveci pneumonia (PCP); cryptosporidiosis; histoplasmosis; toxoplasmosis; other parasitic, viral, and fungal infections; and some types of cancers.