An aerial view shows the P4 laboratory at the Wuhan Institute of Virology in Wuhan in China's central Hubei province on April 17, 2020. - The P4 epidemiological laboratory was built in co-operation with French bio-industrial firm Institut Merieux and the Chinese Academy of Sciences. The facility is among a handful of labs around the world cleared to handle Class 4 pathogens (P4) - dangerous viruses that pose a high risk of person-to-person transmission. (Photo by Hector RETAMAL / AFP)
