China added more than 13,000 new Covid-19 infections with state media reporting a case infected with a new subtype of the omicron variant.

The new iteration of the virus, isolated from a mild Covid-19 patient in a city less than 70 kilometers from Shanghai, evolves from the BA.1.1 branch of the omicron variant

The report said the subtype doesn't match other coronavirus that's causing Covid in China nor those submitted to GISAID

A case in Dalian city in northern China reported on Friday also didn't match any coronavirus found domestically

Almost 12,000 of the cases reported nationwide on Saturday were labelled asymptomatic.

Cases in the financial hub exceeded 8,000 on Saturday including 7,788 asymptomatic infections. Shanghai will start a new round of mass testing on Monday

Vice Premier Sun Chunlan arrived in the country's virus hotspot of Shanghai to oversee prevention efforts, as she ordered officials to curtail the outbreak asap.