Wuhan, the original epicentre of the coronavirus outbreak in China, has tested over 3 million residents for the pathogen since April, and will now focus its testing efforts on the rest of its 11m population, according to state media.

Wuhan will conduct tests on everyone in the city, with the goal of getting a clear number of asymptomatic cases as businesses and schools reopen, the official Xinhua News Agency reported.

The city reported a cluster of infections over the weekend, the first since a virtual lockdown was lifted on April 8, raising fears of a second wave. The latest infections were previously asymptomatic cases, people who had the virus but showed no symptoms such as a fever.

Reuters, citing an internal document to district officials, reported that the city planned to conduct the campaign of city-wide nucleic acid tests over 10 days.