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. 2012 Aug;28(8):928–932. doi: 10.1089/aid.2011.0310

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Copyright 2012, Mary Ann Liebert, Inc.

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FIG. 2. — Maximum likelihood trees of V3 sequences from Latvia and closely related database sequences for subtype A1 (A) and subtype B (B). The color of each branch represents the transmission route of Latvian sequences, while sequences from other countries are colored black. The scale at the bottom indicates nucleotide substitutions per site according to a GTR+G+I model. The subtype A1 tree was rooted using subtype A1 sequences SE8538 (AF069669), SE7253 (AF069670), and SE7535 (AF069671) and the subtype B tree was rooted using the subtype D sequence D.CD.84.84ZR085 (U88822). Three sequence clusters (1–3) in the subtype B tree are indicated. HET, heterosexual; MSM, men who have sex with men; VERT, mother-to-child transmission; IDU, intravenous drug use; Unkn, unknown transmission route.