Staff members work at a production line of COVID-19 self-testing kits at Biouhan healthcare company in Hefei, east China's Anhui Province, March 29, 2022. Since March 11, China has added antigen detection as an option for COVID-19 testing among the public. Such kits are already seen in drug stores, online platforms and multiple detection scenarios in China. With a capacity of up to 10 million kits per day, Biouhan healthcare company is a major manufacturer of COVID-19 antigen self-testing kits in east China's Anhui Province. The testing kits have been used in transportation hubs in Hefei, Anhui Province. (Xinhua/Du Yu)

A staff member works at a production line of COVID-19 self-testing kits at Biouhan healthcare company in Hefei, east China's Anhui Province, March 29, 2022. Since March 11, China has added antigen detection as an option for COVID-19 testing among the public. Such kits are already seen in drug stores, online platforms and multiple detection scenarios in China. With a capacity of up to 10 million kits per day, Biouhan healthcare company is a major manufacturer of COVID-19 antigen self-testing kits in east China's Anhui Province. The testing kits have been used in transportation hubs in Hefei, Anhui Province. (Xinhua/Du Yu)

Staff members work at a production line of COVID-19 self-testing kits at Biouhan healthcare company in Hefei, east China's Anhui Province, March 29, 2022. Since March 11, China has added antigen detection as an option for COVID-19 testing among the public. Such kits are already seen in drug stores, online platforms and multiple detection scenarios in China. With a capacity of up to 10 million kits per day, Biouhan healthcare company is a major manufacturer of COVID-19 antigen self-testing kits in east China's Anhui Province. The testing kits have been used in transportation hubs in Hefei, Anhui Province. (Xinhua/Du Yu)

A staff member shows a COVID-19 antigen self-testing kit at Biouhan healthcare company in Hefei, east China's Anhui Province, March 29, 2022. Since March 11, China has added antigen detection as an option for COVID-19 testing among the public. Such kits are already seen in drug stores, online platforms and multiple detection scenarios in China. With a capacity of up to 10 million kits per day, Biouhan healthcare company is a major manufacturer of COVID-19 antigen self-testing kits in east China's Anhui Province. The testing kits have been used in transportation hubs in Hefei, Anhui Province. (Xinhua/Du Yu)