Dr. Tien Vo drops off food for a man who is quarantining after testing positive for the coronavirus Thursday, July 23, 2020, in Calexico, Calif. Vo began drive-thru coronavirus testing March 23 at his clinic in Calexico. With tests in short supply nationwide, cars filled his parking lot. He soon began taking walk-ins, with lines wrapping around his building. (AP Photo/Gregory Bull)