BEIJING (REUTERS) - New local Covid-19 infections in China declined for a sixth day, official data showed on Monday (Aug 16), as most regions pulled the latest outbreak under control, while others kept up vigilance by adding mass testing or delaying school reopenings.

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.

Five officials in the provincial city of Shangqiu, including one from a hospital, have been stripped of their roles over negligence in virus control efforts, the official Xinhua news agency said.

While the eastern city of Nanjing, linked to many local infections since late last month, has reported no more than two daily local cases since Aug 4, its officials on Sunday delayed the autumn reopening of high schools and kindergartens until the risk dwindles further.

A total of 51 new confirmed coronavirus cases were reported in the mainland for Sunday, the NHC said, including new cases in travellers arriving from abroad.

It also reported 20 new asymptomatic coronavirus cases, which China does not classify as confirmed infections.

No new deaths were reported. By Sunday, mainland China's tally of infections stood at 94,430, with the death toll unchanged at 4,636.