"Disease or Syndrome"^^ . "Opportunistic Infection"^^ . "An infection caused by an organism that does not normally cause disease. Opportunistic infections occur in people with weakened immune systems.NCI-GLOSS" . . "opportunistic infectionPTNCI-GLOSSCDR0000256572" . "Opportunistic Infection"^^ . "Opportunistic InfectionPTNCI" . . . "Opportunistic_Infections"^^ . "Infection caused by an organism that is capable of causing disease in immunocompromised patients only (e.g. HIV-positive or transplanted patients).--2004NCI" . "C3289"^^ . "C0029118"^^ .