People queue to enter a tent erected to test for the coronavirus disease (COVID-19) at the Brooklyn Hospital Center in Brooklyn, New York City, U.S., March 19, 2020. [Photo/Agencies]

Michael J. Ryan, Executive Director of the World Health Organization (WHO) Health Emergencies Programme and Maria Van Kerkhove, Head a.i. Emerging Diseases and Zoonosis attend a news conference on the coronavirus in this Jan 2020 file photo. [Photo/Agencies]

A recovering pneumonia patient gives a thumbs-up to medical workers at Wuhan University's Zhongnan Hospital. [GAO XIANG/FOR CHINA DAILY]