Additional file 1: Figure S1. Contingency Plots by Risk (A) and by HIV subtype (B) among clustering and not clustering individuals. A Mosaic plot of the clustering and not clustering individuals according to the risk of HIV acquisition; B Mosaic plot of the clustering and not clustering individuals according to the HIV subtype. MSM: Man who have sex with Men; HTS: Heterosexual individual; IDU: Injection Drug User.