The Chinese megacity of Guangzhou cancelled hundreds of flights today and launched mass testing of 5.6 million people after one suspected Covid case, as the battle to contain the coronavirus sweeps across the country.
China is facing its worst outbreak since the peak of the first wave in early 2020, with eastern Shanghai recording dozens of daily deaths and the capital Beijing sealing off whole neighbourhoods where handfuls of cases have been detected.
Under its zero-Covid policy, China has used lockdowns, mass testing and travel restrictions to stamp out infections. The strategy is under strain, with the highly transmissible Omicron variant punching through health controls.
Rolling virus restrictions - including a weeks-long lockdown of virtually all of Shanghai's 26 million residents - have damaged the economy, causing backlogs at the world's busiest container port, a key node in the global supply chain.