New local Covid-19 infections in China declined for a sixth day, official data showed, as most regions pulled the latest outbreak under control, while others kept up vigilance by adding mass testing or delaying school re-openings.

In its lowest daily tally since July 24, China reported 13 new domestically transmitted Covid-19 cases for Sunday, the data from the National Health Commission (NHC) showed.

Six local cases each were detected in the eastern province of Jiangsu and the central province of Henan, with one in the southern province of Hunan, the commission said.

Over the weekend, the cities of Zhengzhou and Shangqiu in Henan started a fourth round of mass tests citywide, according to Reuters.