title: Rare HIV-1 strains more prevalent in U.S.
mesh_terms: D005838:Genotype; D015658:HIV Infections / Q000453:epidemiology / Q000635:transmission / Q000821:virology*; D015497:HIV-1 / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D009519:New York City / Q000453:epidemiology; D012747:Sexual Partners; D013045:Species Specificity; D015819:Substance Abuse, Intravenous; D014195:Travel