Figure 1
From: Frequency of subtype B and F1 dual infection in HIV-1 positive, Brazilian men who have sex with men
Phylogenetic tree constructed using a maximum-likelihood method from partial pol region (1279 bp; nt 3822–5101 of HXB2) of 41 samples from MSM that have previously been determined to be infected with HIV-1 subtype B (indicated by black circles) and 37 HIV-1 reference sequences from the Los Alamos HIV-1 database representing 11 genetic subtypes. Samples that were identified in this study to host subclade F1 DNA are indicated with star symbol. For purposes of clarity, the tree was midpoint rooted. The approximate likelihood ratio test (aLRT) values of ≥ 90% are indicated at nodes. The scale bar represents 0.05 nucleotide substitutions per site.