Medical team members take an oath before setting out for Hubei Province, in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 4, 2020. The second batch of medical teams of 136 members from Guangxi set off on Tuesday to aid the coronavirus control efforts in Hubei. (Xinhua/Zhou Hua)

Medical team members set out for Hubei Province, in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 4, 2020. The second batch of medical teams of 136 members from Guangxi set off on Tuesday to aid the coronavirus control efforts in Hubei. (Xinhua/Zhou Hua)

Medical team members set out for Hubei Province, in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 4, 2020. The second batch of medical teams of 136 members from Guangxi set off on Tuesday to aid the coronavirus control efforts in Hubei. (Xinhua/Zhou Hua)

Medical team members pose for a group photo before setting out for Hubei Province, in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 4, 2020. The second batch of medical teams of 136 members from Guangxi set off on Tuesday to aid the coronavirus control efforts in Hubei. (Xinhua/Zhou Hua)

Medical team members take an oath before setting out for Hubei Province, in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 4, 2020. The second batch of medical teams of 136 members from Guangxi set off on Tuesday to aid the coronavirus control efforts in Hubei. (Xinhua/Zhou Hua)

Medical team members take an oath before setting out for Hubei Province, in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 4, 2020. The second batch of medical teams of 136 members from Guangxi set off on Tuesday to aid the coronavirus control efforts in Hubei. (Xinhua/Zhou Hua)