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. (Xinhua/Li Gang)