“…25,26,29,30 The social network strategy to encourage HIV testing among those at highest risk is closely related to the use of partner services (previously known as partner counseling and referral services), in that the partner services provide HIV counseling and testing to partners and associates of high-risk or HIVpositive persons. 7,31,32 Previous studies reported that the cost per person notified of a new HIV diagnosis using partner services ranged from $3800 to $13 000 (seropositivity: 1.3%-21.8%; costs adjusted to US$ 2007). 29,30 The cost analysis of partner services, using methods similar to those presented here, and that of HIV testing in outreach settings, using mobile van, showed that the cost per partner tested and informed of a new HIV diagnosis ranged from $7200 to $22 200 (seropositivity: 6.6%-9.9%).…”