Nigeria, May 28 -- Authorities in Wuhan said they have completed a citywide testing drive of every resident after the reemergence of a cluster of new coronavirus cases sparked fears of a second wave of infections at the birthplace of the now deadly pandemic.

Wuhan government said it tested nearly seven million people in 12 days in the city of over 11 million, several Chinese local media reported Wednesday.

A total of 6.68 million people underwent nucleic acid tests, of which 206 asymptomatic cases were reported, according to Bloomberg calculations based on daily numbers released by the local health commission.

Residents who have not been tested before, and people living in residential compounds with previous cases of infection, or old ...