title: Study theorizes that HIV existed centuries ago in African hamlets.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology* / Q000266:history; D000349:Africa / Q000453:epidemiology; D000818:Animals; D005075:Biological Evolution; D002415:Cats; D004279:DNA, Viral / Q000032:analysis; D004196:Disease Outbreaks; D006678:HIV / Q000235:genetics / Q000472:pathogenicity; D000882:Haplorhini; D049673:History, 20th Century; D049690:History, Ancient; D006790:Host-Parasite Interactions; D006801:Humans; D002679:Pan troglodytes
chemical_list: D004279:DNA, Viral