Reference pol sequences from the Los Alamos database included in the phylogenetic analyses.

1480 n long references sequences of the subtype identified in the Rwandan cohorts were selected from the Los Alamos database. The table indicates the HIV-1 subtypes, respective number of sequences, country of origin and year of sampling. In earlier years subtype A was not yet subdivided into sub-subtype A1. The phylogenetic analysis was done in three separate trees involving subtype A or A1 and C (analysis 1 also shown in figure 4), subtype D (analysis 2) and A1/C recombinant (analysis 3).