On a sunny Monday morning this fall, dozens of Oakland residents lined up outside East Oakland’s Roots Community Health Center, waiting patiently to get tested, treated, or vaccinated against COVID-19, for free. About 10 medical volunteers worked in five outdoor tents set up outside the single-story nonprofit medical center, providing one shot in the arm at a time. It is all part of Roots’ community health outreach strategy to address worryingly low COVID-19 vaccination rates in Oakland’s underserved Black communities….