A police officer in protective gear watches over at an exit from a tunnel Monday in Pudong New Area. The city began a phased lockdown that day in order to test everyone in the city for Covid-19. Photo: VCG

A disease control worker walks in front of a quarantined block in Shanghai on Monday. Photo: Alex Plavevski/IC Photo

A disease control worker sits under a temporary shelter at the entrance to a locked-down neighborhood Friday. Photo: VCG

A delivery driver passes daily necessities to a person on the other side of a barrier outside a residential community in the city. Photo: Aly Song/IC Photo

Residents get tested for Covid-19 at a testing point Monday. The city reported 4,477 local cases that day. Photo: Qilai Shen/VCG

The phased lockdown has divided Shanghai in two. Starting Monday, districts to the east of the Huangpu River (left side) are under lockdown until Friday. Districts west of the river will be under lockdown from Friday to April 5. Photo: VCG

Police in protective gear stand guard Monday on the Nanjing Road pedestrian street on the city’s west side. Photo: IC Photo

Residents stroll down the Bund, located on the west bank of the Huangpu River. Photo: Zhang HengWei/China News Service, VCG