Qiu Hong (2nd L), deputy head of the Liaison Office of the Central People's Government in the Hong Kong Special Administrative Region (HKSAR), and the HKSAR government's Secretary for Constitutional and Mainland Affairs Tsang Kwok-wai (1st L) and Secretary for Food and Health Chan Siu-chee (1st R) welcome virus testing professionals from the Chinese mainland in Hong Kong, south China, Aug. 2, 2020. Seven virus testing professionals from the Chinese mainland arrived in Hong Kong on Sunday afternoon as the first batch of mainland supportive teams to help contain a worsening spread of COVID-19 in Hong Kong. (Photos: Xinhua)

Virus testing professionals from the Chinese mainland pose for a group photo after their arrival in Hong Kong, south China, Aug. 2, 2020. Seven virus testing professionals from the Chinese mainland arrived in Hong Kong on Sunday afternoon as the first batch of mainland supportive teams to help contain a worsening spread of COVID-19 in Hong Kong.

Guo Penghao (2nd L), leader of a team of seven virus testing professionals from the Chinese mainland, receives a bouquet from a representative of local residents in Hong Kong, south China, Aug. 2, 2020. Seven virus testing professionals from the Chinese mainland arrived in Hong Kong on Sunday afternoon as the first batch of mainland supportive teams to help contain a worsening spread of COVID-19 in Hong Kong.

Guo Penghao (R), leader of a team of seven virus testing professionals from the Chinese mainland, and his deputy Deng Zhuohui are pictured after their arrival in Hong Kong, south China, Aug. 2, 2020. Seven virus testing professionals from the Chinese mainland arrived in Hong Kong on Sunday afternoon as the first batch of mainland supportive teams to help contain a worsening spread of COVID-19 in Hong Kong.