Emerg Infect DiseidEmerging Infectious Diseases1080-60401080-6059Centers for Disease Control89031692626882Research ArticleHIV-1 patients may harbor viruses of different phylogenetic subtypes: implications for the evolution of the HIV/AIDS pandemic.PieniazekD.JaniniL. M.RamosA.TanuriA.SchechterM.PeraltaJ. M.VicenteA. C.PieniazekN. K.SchochetmanG.RayfieldM. A.National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.Jul-Sep1995138688