Figure 3. Maximum Likelihood Tree for Heterosexual Transmission Clusters Involving at Least 1 Young Woman Aged 15 to 19 Years.

Linkages with a man 25 years or older are highlighted in blue. For better visualization of the clusters, the tree is represented with proportional branch length transformation. The sex and age (in years) of individuals in a transmission cluster are included. Clusters were identified with support higher than 90% and genetic diversity lower than 4.5% from a data set of 3123 sequences.

^aRoot of the cluster.