Figure 2.

Neighbor joining tree made after bootstrap analysis (500) using Mega 6. Sequences from cohorts ph17-18-19 span GAG-integrase and were gap-stripped prior to performing a clustal W alignment. Values >70 are shown on the branches. Subtypes are marked as described in the key. Pairs of strains at 99 to 100 values (solid brackets) are considered nearly identical. One pair may be closely related (hatched bracket). Discordant DRM appeared in 2 strain pairs (maroon bracket), where 1/2 strains carried DRM. Pairs showing the same DRM are marked with blue brackets. Strain pairs with high relatedness collected from long-term partners are marked by an asterisk.