Residents line up to take Covid-19 nucleic acid tests late Tuesday in Dalian, Northeast China’s Liaoning province.

A resident takes a nucleic acid test. Dalian reported one new infection Tuesday, plus eight locally transmitted asymptomatic cases.

Medical workers register a resident waiting to take a nucleic acid test.

A medical worker checks the personal information provided by a resident. The city has reported six confirmed cases and 20 locally transmitted asymptomatic cases in its latest Covid-19 flare-up.

A crowd waiting to be tested gathers outside a testing center.

Residents line up to be tested. More than 1.2 million city residents have been tested in this latest round of testing, which authorities plan to complete within three days.