Nurses give a child an injection in the maternal and child health hospital in Fuzhou City, southeast China's Fujian Province, Jan. 16, 2018. Since an increasing number of children caught flu in recent days, the medical staff in the hospital worked overtime and treated about 1,500 children every day. (Xinhua/Song Weiwei)

Nurses treat children in the maternal and child health hospital in Fuzhou City, southeast China's Fujian Province, Jan. 16, 2018. Since an increasing number of children caught flu in recent days, the medical staff in the hospital worked overtime and treated about 1,500 children every day. (Xinhua/Song Weiwei)

Children wait to see the doctor in the maternal and child health hospital in Fuzhou City, southeast China's Fujian Province, Jan. 16, 2018. Since an increasing number of children caught flu in recent days, the medical staff in the hospital worked overtime and treated about 1,500 children every day. (Xinhua/Song Weiwei)