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The aim of this study was to determine the distribution of HIV-1 subtypes in patients undergoing highly active antiretroviral therapy (HAART) therapeutic failure in Amazonas and Para, two States in northern Brazil, from 2002 to 2006. This study was performed using plasma collected from individuals with human immunodeficiency virus-1 (HIV-1) and/or acquired immunodeficiency syndrome (AIDS) who were selected from the National Genotyping Network (Rede Nacional de Genotipagem – RENAGENO). From 2002 to 2006, a total of 127 plasma samples from the States of Amazonas and Para, in northern Brazil, were obtained from AIDS and/or HIV-positive patients and subjected to genotyping and resistance testing TM using the ViroSeq Genotyping System kit. Using the genetic information obtained from the HIV-1 protease and/or reverse transcriptase regions, HIV-1 subtype B was identified in 85% of the cases, followed by subtype F1 (4.6%) and the recombinant forms BF1 (4.6%) and CF1 (0.8%). The results of this study were similar to the results of other studies conducted in other regions of Brazil, with the exception of the detection of recombinant CF1, which was described for the first time in the Amazon Region.

Distribution of HIV-1 subtypes in patients with HAART therapeutic failure in the States of Pará and Amazonas, Brazil: 2002 to 2006