The Sullivan County Regional Health Department Will Only Be Providing Second Doses Of The Pfizer Vaccine Today, Wednesday And Friday At Bristol Dragway. No Appointment Is Required. The Doses Will Be Administered Between 9-3. The Vaccination Site At Bristol Dragway Will Be Closed On Tuesday And Thursday. Meanwhile, Second Doses Of The Pfizer Vaccine Will Also Be Given At The Kingsport Civic Auditorium Today And Wednesday From 9-Noon.