Medical workers transfer a patient with fever symptom from a lock-down area at the Xihu community in Tongan District of Xiamen City, southeast China's Fujian Province, Sept. 23, 2021.Photo:Xinhua

Staff members for COVID-19 response stand guard at a checkpoint in Tongan District of Xiamen City, southeast China's Fujian Province, Sept. 23, 2021.Photo:Xinhua

A staff member disinfects a vehicle at an exit of an expressway according to a protocol to curb COVID-19 in Tongan District of Xiamen City, southeast China's Fujian Province, Sept. 23, 2021.Photo:Xinhua

Police offers patrol outside a lock-down area at the Xihu community in Tongan District of Xiamen City, southeast China's Fujian Province, Sept. 23, 2021.Photo:Xinhua

Staff members for COVID-19 response deliver food for residents under quarantine at the Xihu community in Tongan District of Xiamen City, southeast China's Fujian Province, Sept. 23, 2021.Photo:Xinhua

Residents wait in line to receive nucleic acid testing outside a testing site at Butang Village in Tongan District of Xiamen City, southeast China's Fujian Province, Sept. 23, 2021. Photo:Xinhua