A recovered COVID-19 patient (C) led by a medical worker moves into the rehabilitation ward at Liaoning COVID-19 Treatment Shenyang Center in Shenyang, northeast China's Liaoning Province, Jan. 9, 2021. Two patients diagnosed with novel coronavirus disease (COVID-19) in this wave of epidemic in Shenyang have recovered and moved into rehabilitation wards for medical observation on Saturday. (Xinhua/Yao Jianfeng)

Professor Ma Xiaochun, a member of the National Health Commission experts team, receives an interview at Liaoning COVID-19 Treatment Shenyang Center in Shenyang, northeast China's Liaoning Province, Jan. 9, 2021. Two patients diagnosed with novel coronavirus disease (COVID-19) in this wave of epidemic in Shenyang have recovered and moved into rehabilitation wards for medical observation on Saturday. (Xinhua/Yao Jianfeng)

A recovered COVID-19 patient (L) led by a medical worker moves into the rehabilitation ward at Liaoning COVID-19 Treatment Shenyang Center in Shenyang, northeast China's Liaoning Province, Jan. 9, 2021. Two patients diagnosed with novel coronavirus disease (COVID-19) in this wave of epidemic in Shenyang have recovered and moved into rehabilitation wards for medical observation on Saturday. (Xinhua/Yao Jianfeng)