Wuhan, the Chinese city where the coronavirus pandemic began, conducted well over 1 million nucleic acid tests on Saturday, the local health authority said.
A total of 1.1 million tests were administered, down from 1.4 million the day before.
A new mass testing drive started following the emergence of a cluster of new infections. Authorities had originally promised to test all 11 million people in 10 days.
A wet market in Wuhan is believed to be the source of Covid-19, which has claimed the lives of more than 341,000 globally.