Fig. 3

Transmission networks of CRF01_AE (Fig. 3a) and CRF07_BC strains (Fig. 3d). The node represents an HIV sequence or an HIV-infected person, and the edge represents two HIV-infected people connected with a potential transmission relationship. The diamonds, ellipses and triangles represent individuals infected by HIV through heterosexual contact, homosexual contact or unknown contact, respectively. The 2 subnetworks of CRF01_AE (Fig. 3b, Fig. 3c ) and the other 2 subnetworks of CRF07_BC (Fig. 3e, Fig. 3f) on the right contain sequences from patients with higher degrees. The different colours represent different ages. Blue, green, yellow, purple and red represent ages ≤20, 21–30, 31–40, 41–50, and > 50, respectively