China reported on Monday more COVID-19 infections in its latest outbreak of the disease, while some cities added rounds of mass testing in the bid to stamp out locally-transmitted infections. The highly infectious Delta variant has been detected in more than a dozen cities since July 20, and officials have ordered local governments to keep close track of infections and close loopholes in control efforts. "A laxity of mind should be firmly overcome," the National Health Commission (NHC) said on Sunday, calling for the outbreak to be curbed.