Clusters by risk group. Subtype A1 and B human immunodeficiency type 1 (HIV-1) pol sequences collected in Kiev, April 2013–March 2015. Groups based on >60% of samples in the cluster. Abbreviations: Het, heterosexual sexual contact (male and female); HetM/MSM, heterosexual males (sexual contact and PWID) and men who have sex with men; Het/PWID, heterosexual sexual contact (male and female) and people who inject drugs (male and female); MSM, men who have sex with men; PWID, people who inject drugs (male and female).