Figure 3
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 pol -IN (219 bp ; nt 4269–4488 of HXB2) fragments from five of the samples isolated from MSM observed to be infected with both subtype B (indicated by black circles) and subclade F1 DNA (indicated by black squares) along with HIV-1 reference sequences from the Los Alamos HIV-1 database representing 11 genetic subtypes. For purposes of clarity, the tree was midpoint rooted. The approximate likelihood ratio test (aLRT) values of ≥ 70% are indicated at nodes. The scale bar represents 0.05 nucleotide substitutions per site.