Figure 1

Phylogenetic analysis of HIV-1B in Indonesia. The phylogenetic tree was constructed using the approximately maximum likelihood method based on the pol region (HXB2 numbering: nt 2253–3306) in PhyML. HIV-1 subtype C sequences were used as the outgroup in the rooted tree. The nucleotide substitution model was GTR + Γ + I. Approximate Likelihood Ratio Test (aLRT) values ≥ 0.85 were used to identify the clade. The countries of origin of each sequence are indicated by the ISO 3166 two-letter code (https://www.iso.org/obp/ui/#iso:pub:PUB500001:en) as follows: CN, China; ID, Indonesia; US, the United States of America; TH, Thailand; MY, Malaysia; JP, Japan.