FILE - In this Thursday, March 12, 2020 file photo, an entrance gate is closed at the usually crowded Forbidden City in Beijing, due to the CO…

FILE - In this Thursday, Feb. 23, 2017 file photo, Shi Zhengli works with other researchers in a lab at the Wuhan Institute of Virology in Wuh…

FILE - In this Tuesday, March 10, 2020 file photo, a giant TV screen at a quiet shopping mall in Beijing shows President Xi Jinping talking to…

FILE - In this Tuesday, Feb. 4, 2020 file photo, workers arrange beds in a convention center that has been converted into a temporary hospital…

FILE - In this Monday, March 9, 2020 file photo, Tedros Adhanom Ghebreyesus, second left, director-general of the World Health Organization sp…

FILE - In this Sunday, Jan. 26, 2020 file photo, Gao Fu, foreground left, the head of the Chinese Center for Disease Control and Prevention, s…

FILE - In this Thursday, Jan. 23, 2020 file photo, Dr. Gauden Galea, the World Health Organization representative in China, speaks during an i…

FILE - In this March 2, 2020 photo released by Xinhua News Agency, respiratory specialist Zhong Nanshan attends an oath-taking ceremony via vi…

FILE - In this Wednesday, Jan. 29, 2020 file photo, Maria van Kerkhove, head of the Outbreak Investigation Task Force for the World Health Org…

FILE - In this Tuesday, Jan. 28, 2020 file photo, people wearing face masks walk down a deserted street in Wuhan in central China's Hubei Prov…