The Leaky Preexposure Prophylaxis Cascade: Barriers and Facilitators to Preexposure Prophylaxis Uptake and Adherence Among Youth Experiencing Homelessness in the US South, a Mixed Methods Study.

Adherence to preexposure prophylaxis (PrEP) is lower among high-risk populations, including youth experiencing homelessness (YEH). This study determined the feasibility of urine PrEP adherence biomarker testing and examined the barriers and facilitators to PrEP uptake and adherence among YEH. YEH were recruited from a randomized control trial conducted in a large urban setting in southern United States.