
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.Photo:Xinhua

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.Photo:Xinhua

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.Photo:Xinhua

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.Photo:Xinhua

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.Photo:Xinhua