Protease and the first half of reverse transcriptase from 71 Romanian patients failing highly active antiretroviral therapy (HAART) have been sequenced and phylogenetically analyzed. These analyses show that 70 patients were infected with subtype F1 and one with subtype C. The pattern of drug resistance mutations in subtype F1-infected patients failing HAART is similar to that described for subtype B strains. These results show that the diversity pattern of HIV type 1 infection in Romania has remained steady over a decade, with subtype F1 remaining the predominant viral form. The circulation of subtype F1 in Romania has the potential to be a source of this HIV-1 subtype in Europe..
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