Table 1 Acronyms used

ACASI

Audio Computer-Assisted Interviewing format

CDC

Centers for Disease Control and Prevention

HHR

Heterosexuals at high risk (for HIV)

HRA

High-risk area

ICER

Incremental cost-effectiveness ratios

MI

Motivational Interviewing

MRF

Medical Report Form

MSM

Men who have sex with men

NHBS

National HIV Behavioral Surveillance

NIDA

National Institute on Drug Abuse

OR

Odds Ratio

PWID

Persons who inject drugs

RDS

Respondent-driven sampling

RDS-ASTN

Anonymous single-session testing with navigation (using RDS)

RDS-CTTN

Confidential two-session testing with navigation (using RDS)

STTR

Seek, Test, Treat and Retain

VBS

Venue-based sampling