People experiencing homelessness are at elevated risk of SARS-CoV-2 infection. yet estimates generally exclude re-infections and rely on data sources affected by testing policies or study timing. In this prospective cohort study. we report incidence of SARS-CoV-2 infection and re-infections over time using a combination of community-based and study-administered testing. https://www.roneverhart.com/DeRoyal-LMB-Spring-Finger-Extension-Assist/