Workers put fences at a junction Wednesday morning in Zhengzhou, Central China’s Henan province. The local government further tightened restrictions in certain neighborhoods to curb the Covid-19 outbreak. Photo: Chen Liang/Caixin

Parts of subway in Nanjing, East China’s Jiangsu province, are shut down on Tuesday to prevent crowding. Photo: VCG

A resident passes through an empty shopping district on Tuesday in Jiangning district, Nanjing. Photo: Yang Bo/China News Service, VCG

A security staff puts packages ordered by residents online on a rack at an entrance of a locked-down neighborhood, where a positive case was confirmed, in Beijing on Wednesday. Photo: VCG

Residents read a notice about Covid-19 restrictions at a junction of Longhai road and Xinzheng road in Zhengzhou on Wednesday. Photo: Chen Liang/Caixin

A driver scans the health QR code to get into a neighborhood Wednesday in Lianyungang, East China’s Jiangsu province. Photo: VCG

Residents stand in line to buy commodities and take packages in a blocked area in Zhengzhou on Wednesday. Photo: VCG

Medical workers and police stand by outside a locked-down neighborhood in Wangjing, Beijing. Photo: VCG

A worker sprays disinfectant on a road in Yangzhou, East China’s Jiangsu province, on Tuesday. Photo: VCG

A sign placed at a toll station near Zhengzhounan Railway Station notifies passengers to show Covid-19 testing results on Tuesday in Zhengzhou. Photo: VCG

Wuhan, the capital of central China’s Hubei province, has restricted traffic at a junction in Jingkai district on Tuesday. Photo: VCG

Zhangjiajie Hehua International Airport in central China’s Hunan province has canceled all departure flights Saturday due to the outbreak. Photo: VCG

Workers wearing protective suits help to deliver commodities to residents in a locked-down neighborhood in Shanghai on Tuesday. Photo: VCG

A cleaning worker passes by a sign urging residents to take self-protection measures against Covid-19 on Monday in Changsha, capital of central China’s Hunan province. Photo: VCG