title: The origins of HIV-1 and HTLV-4/HIV-2.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000382:microbiology* / Q000635:transmission; D000350:Africa, Central; D000354:Africa, Western; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D003429:Cross Reactions; D006800:Deltaretrovirus Infections / Q000382:microbiology; D006678:HIV / Q000145:classification / Q000276:immunology / Q000302:isolation & purification; D000882:Haplorhini / Q000382:microbiology; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000382:microbiology / Q000662:veterinary; D008992:Monkey Diseases / Q000382:microbiology; D012190:Retroviridae / Q000145:classification / Q000276:immunology; D013045:Species Specificity; D014481:United States; D015047:Zoonoses / Q000382:microbiology / Q000635:transmission
chemical_list: D000914:Antibodies, Viral