A doctor at Ala Stanford University, but now her office is a parking lot, a street corner, and the sidewalk outside the Philadelphia Baptist Church. Stanford University led a mobile team of doctors who took the free Covid-19 test to the community hardest hit by the virus in Philadelphia: the underserved black community. Across the United States, blacks are infecting and dying of Covid-19 at an extremely disproportionate rate, and in some areas, they are not as frequently tested for the virus as whites.