This document outlines a research study to test interventions for improving linkage, engagement, and retention in HIV care and pre-exposure prophylaxis (PrEP). The study will use an ALERT specialist to link newly diagnosed HIV patients and high-risk HIV-negative individuals to care and clinics. It will also test if text messaging improves retention and adherence to PrEP for HIV-negative individuals. The goals are to determine how effective the ALERT specialist and text messaging are at improving outcomes like linkage to care, retention in care, and antiretroviral adherence over 48 weeks. Community engagement organizations will help establish the study and educate communities about HIV treatment and PrEP.