The goal of this interrupted time series quasi-experimental design study is to implement universal opt- out HIV testing and linkage to HIV preventive care in 15-21 year old adolescents visiting the pediatric emergency department (ED). The main question\[s\] it aims to answer are: 1. What is the uptake, reach and effectiveness of universally offered, opt-out HIV screening across pediatric EDs after implementing an adapted version of a tablet-based screening process? 2. What is the successful linkage to comprehensive HIV pre-exposure prophylaxis (PrEP) care using a novel, digital health platform? Participants will 1. Complete the previously developed and validated computerized sexual health screen (cSHS) containing questions regarding their personal sexual health history 2. Have the opportunity to opt-out of clinician-ordered HIV testing 3. Patients meeting CDC criteria for HIV PrEP will be given the opportunity to enroll in the digital health PrEP linkage platform and followed for 3 months after enrollment.