Medics supporting virus-hit Huanggang City of Hubei Province pose for a group picture after arriving at the Jinan Yaoqiang International Airport in Jinan, east China's Shandong Province, March 21, 2020. A total of 576 medical staff supporting Hubei from Shandong returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Xinhua/Wang Kai)

A medic supporting virus-hit Huanggang City of Hubei Province waves after arriving at the Jinan Yaoqiang International Airport in Jinan, east China's Shandong Province, March 21, 2020. A total of 576 medical staff supporting Hubei from Shandong returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Xinhua/Wang Kai)

A medic supporting virus-hit Huanggang City of Hubei Province weeps after arriving at the Jinan Yaoqiang International Airport in Jinan, east China's Shandong Province, March 21, 2020. A total of 576 medical staff supporting Hubei from Shandong returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Xinhua/Wang Kai)

An airplane carrying medics supporting virus-hit Huanggang City of Hubei Province arrives at the Jinan Yaoqiang International Airport in Jinan, east China's Shandong Province, March 21, 2020. A total of 576 medical staff supporting Hubei from Shandong returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Xinhua/Wang Kai)

Medics supporting virus-hit Huanggang City of Hubei Province arrive at the Jinan Yaoqiang International Airport in Jinan, east China's Shandong Province, March 21, 2020. A total of 576 medical staff supporting Hubei from Shandong returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Xinhua/Wang Kai)

The flight carrying medics supporting virus-hit Hubei Province arrives at the Lanzhou Zhongchuan International Airport in Lanzhou, northwest China's Gansu Province, March 21, 2020. The second batch of medical assistance team supporting Hubei from Gansu, which consists of 137 members, returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Photo by Du Zheyu/Xinhua)

A bus carrying medics supporting virus-hit Hubei Province arrives at a designated place for quarantine in Lanzhou, northwest China's Gansu Province, March 21, 2020. The second batch of medical assistance team supporting Hubei from Gansu, which consists of 137 members, returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Photo by Du Zheyu/Xinhua)

A bus carrying medics supporting virus-hit Hubei Province runs through the downtown area of Lanzhou, northwest China's Gansu Province, March 21, 2020. The second batch of medical assistance team supporting Hubei from Gansu, which consists of 137 members, returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Photo by Du Zheyu/Xinhua)

A child shows a welcome note written to his father, one of the medics supporting virus-hit Hubei Province, in Lanzhou, northwest China's Gansu Province, March 21, 2020. The second batch of medical assistance team supporting Hubei from Gansu, which consists of 137 members, returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Photo by Du Zheyu/Xinhua)

Medics supporting virus-hit Hubei Province arrive at the Lanzhou Zhongchuan International Airport in Lanzhou, northwest China's Gansu Province, March 21, 2020. The second batch of medical assistance team supporting Hubei from Gansu, which consists of 137 members, returned home on Saturday as the epidemic situation in Hubei has been greatly eased. (Photo by Du Zheyu/Xinhua)