China sees record Covid-19 cases

China reported more than 20,000 Covid-19 cases yesterday, the highest daily tally given since the start of the pandemic as millions in locked-down Shanghai began a new round of testing. The country's "zero-Covid" strategy has come under immense strain as cases spike, with around 25 million residents of Shanghai -- China's largest city and economic engine room -- ordered to stay at home as the authorities struggle to contain the outbreak. The majority of the cases are, however, asymptomatic. Authorities reported no new deaths, in a country which says only two people have died of the virus in nearly two years.