title: Epidemiologic and clinical aspects of opportunistic infections.
mesh_terms: D002493:Central Nervous System Diseases / Q000209:etiology / Q000382:microbiology; D003428:Cross Infection / Q000209:etiology / Q000517:prevention & control; D006801:Humans; D007108:Immune Tolerance; D007153:Immunologic Deficiency Syndromes / Q000150:complications*; D009894:Opportunistic Infections / Q000453:epidemiology* / Q000209:etiology / Q000517:prevention & control; D011014:Pneumonia / Q000209:etiology; D012871:Skin Diseases / Q000209:etiology / Q000382:microbiology; D014481:United States