China has been hit by what state media are calling the 'most extensive Covid outbreak since Wuhan' after cases of the Delta variant escaped border quarantine
* The Delta variant has reached more than 20 cities and a dozen provinces
* Local governments are carrying out mass testing and cordoning off homes
* Some cities are under strict lockdowns with residents unable to leave home
Millions of people have been placed back into lockdown in China as the country tries to contain its largest coronavirus outbreak in months with mass testing and travel curbs.
The country reported 55 new locally transmitted coronavirus cases today as an outbreak of the fast-spreading Delta variant reached over 20 cities and more than a dozen provinces.
The latest surge, which state media has labelled the 'most extensive outbreak of Covid since Wuhan', began when airport workers in Nanjing who had cleaned a plane that arrived from Russia later tested positive for the virus.