We would like to describe and characterize patterns of engagement in HIV care using a dataset of patient care visits >200,000 people living with HIV in Tanzania. We'd like to describe patterns of engagement and loss to follow-up following initial initiation of antiretroviral therapy. We will prepare tables, visualizations, and various statistical analyses. We will share our findings with the government and potentially create a peer-reviewed publication. Note: This study will require adding the team members to our CPHS (IRB) application.