The AIDS virus--well known but a mystery.
D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology / Q000382:microbiology / Q000635:transmission*; D002450:Cell Communication; D006678:HIV / Q000472:pathogenicity* / Q000502:physiology; D006801:Humans; D007111:Immunity, Cellular; D014779:Virus Replication