Ambulances that will transport the close contacts of the new Covid-19 case arrive at Shanghai Pudong Hospital on Saturday. Photo: Bao Zhiming/Caixin

Medical workers and patients’ relatives line up to take nucleic acid tests at the hospital, where a nurse was confirmed with the coronavirus Saturday. Photo: Bao Zhiming/Caixin

Medical workers in full protective gear enter the hospital. Photo: Bao Zhiming/Caixin

A total of 4,015 people have taken nucleic acid tests at Shanghai Pudong Hospital. Photo: Bao Zhiming/Caixin

Medical workers line up to board buses that will transport them to a central facility for 14 days of isolation. Photo: Bao Zhiming/Caixin

A bus driver waits outside Shanghai Pudong Hospital Sunday morning before picking up the last several medical workers waiting to go to the isolation facility. Photo: Bao Zhiming/Caixin