BEIJING: China reported no new domestic coronavirus cases Monday, and Beijing appears poised to bring to heel the pandemic's most serious resurgence in months - driven by the highly contagious Delta variant - with mass testing and targeted lockdowns.

The latest outbreak, which began in mid-July when cleaners at a Nanjing airport tested positive, is the most severe since Covid-19 first surfaced in the central city of Wuhan. Over a thousand people have been infected across dozens of cities.

But Communist authorities reacted with swift localised lockdowns, travel restrictions and mass testing of neighbourhoods with infections as part of their "zero case" approach to the pandemic, which has virtually sealed off China's borders but allowed the economy to rebound.

New domestic infections have been falling for over two weeks.

On Monday, National Health Commission data showed local infections returned to zero after a five week battle.

Meanwhile health experts are attempting to shore up confidence in the country's vaccination drive with leading virologist Zhong Nanshan saying "effective herd immunity" is on the horizon once over 80 percent of the population is vaccinated - a target likely achieved by year-end.