FILE - In this Wednesday, Jan. 22, 2020 file photo, hospital staff wash the emergency entrance of Wuhan Medical Treatment Center, where some infected with a new virus are being treated, in Wuhan, China. A panel of experts commissioned by the World Health Organization has criticized China and other countries for not moving to stem the initial outbreak of the coronavirus earlier and questioned whether the U.N. health agency should have labeled it a pandemic sooner. (AP Photo/Dake Kang, File)

FILE - In this Wednesday, Jan. 22, 2020 file photo, Health Officials in hazmat suits wait at the gate to check body temperatures of passengers arriving from the city of Wuhan, at the airport in Beijing, China. A panel of experts commissioned by the World Health Organization has criticized China and other countries for not moving to stem the initial outbreak of the coronavirus earlier and questioned whether the U.N. health agency should have labeled it a pandemic sooner. (AP Photo Emily Wang, File)