title: HIV comes in five family groups.
authors.forename: S
authors.initials: S
authors.lastname: Sternberg
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000382:microbiology*; D000349:Africa; D006678:HIV / Q000145:classification* / Q000235:genetics / Q000276:immunology; D015497:HIV-1 / Q000145:classification / Q000235:genetics; D006801:Humans