Acute Partner and Social Contact Referral: iKnow

Inclusion Criteria: * Active and Base Case Index Participants: * Acute HIV-1 infection documented by a negative or discordant rapid HIV test results and detectable HIV RNA OR established HIV infection based on two positive HIV antibody rapid tests at the time of screening. * Men and women age \>/= 18 years. * Current resident in the Lilongwe area. * Ability and willingness of participant to provide informed consent. * Willingness to provide contact/locator information to be contacted for AHI results if rapid test is negative or discordant. Partners and Social Contacts (referred by active arm): * Referred by active arm participant and presenting to STI clinics with a referral card. * Men and women age \>/= 18 years. * Intention to remain in the Lilongwe area for the duration of the study. * Ability and willingness of participant to provide informed consent. * Willingness to provide contact/locator information to be contacted for AHI results if rapid test is negative or discordant. Partners (referred by base case arm): * Referred by base case arm participant and presenting to STI clinics with a referral card. * Men and women age \>/= 18 years. * Ability and willingness of participant to provide informed consent. Exclusion Criteria: Active and Base Case Index Participants: * HIV-negative based on one or more antibody rapid test and an HIV RNA PCR test. * Serious illness, including tuberculosis or opportunistic infection, requiring systemic treatment and/or hos…