The investigators will enroll 150 human immunodeficiency virus (HIV) seronegative contacts presenting to sexually transmitted infections (STI) clinics for HIV testing and referrals from the Chicago Center for HIV Elimination (CCHE) network-based projects, ages 18 - 35, in this study over a period of 18 months referred from University of Chicago clinics and outreach space that perform HIV Partner Services as well as Expanded HIV testing and Linkage to Care (XTLC) and Chicago Department of Public Health (CDPH) partner notification services on the South Side of Chicago.