David Carter, 49, an employee of the Richmond Department of Public Works, receives the single-dose Johnson & Johnson COVID-19 vaccine May 5 during a walk-up vaccination clinic held at George Wythe High School by the Richmond and Henrico health districts. No appointments are needed for the health districts’ clinics. The school at 4314 Crutchfield St. in South Richmond will be among several sites offering inoculations during the coming days. The next vaccine clinics at George Wythe will be noon to 5 p.m. Tuesday, May 18, and 3 to 6 p.m. Wednesday, May 19. The Johnson & Johnson vaccine will be available, along with the two- dose Pfizer vaccine.