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Maximum likelihood phylogenies inferred from subtype A1 and D gag, protease-RT, integrase, and nef sequence data sets. For subtype A1, 203 gag, 222 protease-RT, 200 integrase, and 210 nef sequences were collected. For subtype D, 134 gag, 154 protease-RT, 140 integrase, and 127 nef sequences were collected. All sequences cluster according to their classified subtype. All phylogenies are drawn on the same distance scale; units are in estimated numbers of nucleotide substitutions per site.
