Liao Yalong, a member of a team of seven virus testing professionals from southern China's Guangdong Provincial People's Hospital, takes leave of his families at home before setting out to Hong Kong for assistance in COVID-19 fight, in Guangzhou, south China's Guangdong, 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/Deng Hua)