HIV-1 subtype distribution in Senegal compared to Gambia. The left chart shows the distribution in the 183 LAHDB sequences from Senegal >800 bp. The right chart shows the distribution in all LAHDB subtyped HIV-1 sequences from Gambia >800 bp (4 entries) plus the 38 sequences from the current work (42 entries total). Note that the CRF49_cpx viruses identified in this study were included in the J category. The frequency of selected subtypes with 95% confidence intervals (calculated using the modified Wald method) were Gambia J 21% (11.2-35.4%), Gambia CRF 02_AG 49% (34.6-63.3%); Senegal J 0.6% (< 0.01 to 3.3%), Senegal CRF 02_AG 31% (24-38%).