Home This photo taken on February 3, 2020 shows a doctor being disinfected by his colleague at a quarantine zone in Wuhan, the epicentre of the new coronavirus outbreak, in China’s central Hubei province. (Photo by STR/AFP via Getty Images) This photo taken on February 3, 2020 shows a doctor being disinfected by his colleague at a quarantine zone in Wuhan, the epicentre of the new coronavirus outbreak, in China's central Hubei province. (Photo by STR/AFP via Getty Images)

This photo taken on February 3, 2020 shows a doctor being disinfected by his colleague at a quarantine zone in Wuhan, the epicentre of the new coronavirus outbreak, in China’s central Hubei province. (Photo by STR/AFP via Getty Images)

This photo taken on February 3, 2020 shows a doctor being disinfected by his colleague at a quarantine zone in Wuhan, the epicentre of the new coronavirus outbreak, in China’s central Hubei province. – The number of total infections in China’s coronavirus outbreak has passed 20,400 nationwide with 3,235 new cases confirmed, the National Health Commission said on February 4. (Photo by STR / AFP) / China OUT (Photo by STR/AFP via Getty Images)

A staff works in the pop-up Huoyan Laboratory specialized in the nucleic acid test on 2019-nCoV in Wuhan in central China’s Hubei province Thursday, Feb. 06, 2020, the first day of its operation. (Photo credit should read Feature China/Barcroft Media via Getty Images)