Global disease experts say little is known about China's experience with long-term COVID effects thought to have afflicted millions with debilitating fatigue, brain fog and other symptoms
This status is achieved when a district has three consecutive days with no new daily increases in infections, city government official Gu Honghui told a news conference.
Public transport will be allowed to resume in five of the six districts, a city health official added, but did not say when.
Despite the fall in transmissions, Shanghai will launch a new round of citywide PCR and antigen tests from Sunday until May 7, Gu added.