title: Origins of the AIDS viruses, HIV-1 and HIV-2: fact or fiction.
authors.forename: B A
authors.initials: BA
authors.lastname: Dale
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000382:microbiology; D015497:HIV-1; D015498:HIV-2; D006801:Humans