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All the viruses were HIV-1 subtype B' variants (Thai B, a subset of subtype B) through phylogenetic analysis of V3 region gene. The phylogenetic tree showed that variance of all the HIV viruses are close to B.FR.HXB2 (HIV-1 subtype B) and closer to B.CN.RL42 (Thai B', a clade of HIV-1 B)(see Figure 1).
