This FOA solicits innovative research to optimize HIV prevention and care which is aligned with NIMH Division of AIDS Research (DAR) priorities. Applications may include formative basic behavioral and social science to better understand a step or steps in the HIV prevention or care continuum, and/or the initial development and pilot testing of innovative intervention approaches, and intervention efficacy or effectiveness trials. Applicants are encouraged to read current Notices of Special Interests (NOSIs) from NI...