Two new papers from Mass General Brigham demonstrate the effectiveness of bringing COVID-19 health care services to where people need them the most. At the beginning of May 2021, a team from Mass General Brigham began providing COVID vaccinations to underserved populations living in the greater Boston area by sending mobile health units to 12 predominantly low-income and racial/ethnic minority communities in Massachusetts. Using community health vans, teams offered easily accessible vaccination on a walk-in basis without regard to insurance, immigration status, or ability to pay.