The majority of San Francisco residents have gotten vaccinated against the coronavirus. But a lack of trust in the healthcare system or trouble making an appointment or going to a vaccination site may still pose barriers for some, especially people experiencing homelessness. Dr. Margot Kushel, a physician and researcher who directs the UCSF Benioff Homelessness and Housing Initiative, is part of a collaborative multi-organizational effort to bring the vaccines to people out on the streets.