The purpose of this study is to gather information needed to develop a large prevention trial to decrease risk for Human Immunodeficiency Virus (HIV) transmission among HIV-discordant couples (where one person is HIV-positive and the other is HIV-negative) in Lesotho. The protocol team would like to explore new strategies for increasing the number of partners who receive an HIV test and whether this increase in testing also results in identifying HIV-discordant couples. These couples would be the focus of the future large prevention trial, therefore it is critical that the protocol team explore effective strategies for identifying and recruiting these couples. Men and women (index participants) who are attending Antenatal Care (ANC),Tuberculosis (TB) and antiretroviral therapy (ART) clinics will be recruited for this study. If they agree to take part, a testing team will visit their household and offer all adults staying in the house the opportunity to conduct a self-test for HIV. Seventy-ﬁve index participants will be enrolled into the study and have their homes visited by the testing team. The number of household members tested will depend on the number of people living in each household.