Fig. 1

Phylogenetic tree analysis based on HIV-1 pol gene sequences obtained from this study. The neighboring-joining tree was constructed using MEGA 6.0 with 1000 bootstrap replicates. The reference sequences (A–D, F–H, J, K, O, CRF01_AE) were obtained from the HIV database (http://www.hiv.lanl.gov/content/index).