Covid-19 control personnel are gathered in a village in Shenzhen, South China’s Guangdong province, on March 2, as they await instructions. The epidemic has spread to over 20 provincial-level regions this year, the National Health Commission said on Tuesday. Photo: VCG

Health care workers walk along a street in Ruili, Southwest China’s Yunnan province, on Sunday. Yunnan reported five Covid-19 cases, including four local cases and one imported on Tuesday. Photo: VCG

Barbed wire and barricades prevent visitors from entering Nongmo Lake Park in Ruili amid the current Covid-19 outbreak on Feb. 28. Photo: VCG

A resident picks up bouquet of flowers that was delivered outside a community placed on lockdown in Haidian district of Beijing on Tuesday. The city reported seven Covid-19 cases on Tuesday. Photo: VCG

Ambulances are parked on a road that has been closed as part of pandemic control measures on Friday in Shijiazhuang, North China’s Hebei province. Photo: VCG

A worker sprays disinfectant on a street near Hubu Xiang on Feb. 24, a pedestrian alley known for its street food stalls in Wuhan, Central China’s Hubei province. The local government downgraded the risk level to “low” in the area as no new cases were reported on Tuesday. Photo: VCG

Covid-19 control personnel prepare to conduct nucleic acid tests on residents Monday in Yuncheng, North China’s Shanxi province. Three local cases were reported in the province on Tuesday. Photo: VCG

A resident gets registered Sunday at a Covid-19 testing point in Jilin City, Northeast China’s Jilin province. The province reported 94 local cases on Tuesday. Photo: VCG

Residents wait in line in the snow to get Covid-19 tests on March 2 in Harbin, Northeast China’s Heilongjiang province. Photo: VCG

Shanghai residents wait in line outside a Covid-19 testing point to get tested on Sunday. City authorities reported 18 infections and designated one area within the city as medium risk on Tuesday. Photo: VCG

A crowd formed at a Covid-19 testing point Thursday night in Shenzhen. Over 500 cases were reported across 16 provinces in China on Monday. Photo: VCG