Figure 2.

Phylogenetic analysis of Trinidad HIV-1 C2-V5 sequences and comparison with clade B sequences from the San Francisco Men's Health Study (SFMHS) and Thailand heterosexuals/drug users. Black triangles designate five of 31 isolates lacking the signature threonine deletion in the V3 loop. Yellow triangles represent 26 of 31 isolates with the threonine deletion. RH0011 refers to a 1987 isolate from a gay man ascertained as seropositive in 1983. QH samples represent incident infections from 1993–1997, QZ samples represent prevalent cases from 1987–1993 except for QZ4374, which came from an incident case in 1993.