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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)