Fig. 2

a. Sociosexual network (N = 1470). Sociosexual network showing 569 index cases newly diagnosed with HIV in the area around Raleigh, North Carolina, during 2012–2013. Total graph includes 1470 persons distributed in 468 network components. Graph shows gender (node shape), HIV status (node color), HIV index case status (node size), type of contact (edge color), and whether the contact was part of an HIV or syphilis investigation (edge thickness). Graph is loosely grouped by size of sociosexual network component: a isolates (n = 248 people), b dyads (n = 238 people distributed across 119 components), c components size 3–4 (n = 224 people distributed across 68 components), d components size 5–16 (n = 241 people distributed across 29 components), and e) components size 26, 81, 92, and 320 (n = 519 people distributed across 4 components). b. Three largest components of the sociosexual network (n = 493). Legend: Sociosexual network showing the three largest components representing 493/1,470 (34%) network members (from left to right, 320, 92, and 81 people, respectively). Graph shows gender (node shape), HIV status (node color), index case status (node size), type of contact (edge color), and whether the contact was part of an HIV or syphilis investigation (edge thickness). The middle component (n = 92 nodes) would have been observed as six smaller HIV investigation components (indicated by gray background) without inclusion of the syphilis investigation partnerships bridging the relationships elicited during the HIV investigations