Mobile COVID-19 test vehicles set out to Hong Kong for assistance in COVID-19 fight, in Shenzhen, south China's Guangdong Province, Feb. 17, 2022. China's National Health Commission (NHC) said in a statement on the website that it has been paying close attention to the fifth wave of the COVID-19 pandemic in Hong Kong. (Xinhua/Liang Xu)

A panel of epidemiology experts gather before setting out to Hong Kong for assistance in COVID-19 fight, in Shenzhen, south China's Guangdong Province, Feb. 17, 2022. China's National Health Commission (NHC) said in a statement on the website that it has been paying close attention to the fifth wave of the COVID-19 pandemic in Hong Kong. (Xinhua/Liang Xu)

A panel of epidemiology experts set out to Hong Kong for assistance in COVID-19 fight, in Shenzhen, south China's Guangdong Province, Feb. 17, 2022. China's National Health Commission (NHC) said in a statement on the website that it has been paying close attention to the fifth wave of the COVID-19 pandemic in Hong Kong. (Xinhua/Liang Xu)

Mobile COVID-19 test vehicles set out to Hong Kong for assistance in COVID-19 fight, in Shenzhen, south China's Guangdong Province, Feb. 17, 2022. China's National Health Commission (NHC) said in a statement on the website that it has been paying close attention to the fifth wave of the COVID-19 pandemic in Hong Kong. (Xinhua/Liang Xu)

A panel of epidemiology experts set out to Hong Kong for assistance in COVID-19 fight, in Shenzhen, south China's Guangdong Province, Feb. 17, 2022. China's National Health Commission (NHC) said in a statement on the website that it has been paying close attention to the fifth wave of the COVID-19 pandemic in Hong Kong. (Xinhua/Liang Xu)