New cases are caused by a type of coronavirus delta.
At the start of the pandemic, the Chinese government shut down Wuhan from the outside world for 76 days, subjecting 11 million people to strict quarantine, and eventually managed to quell the outbreak.
Since then, China has been taking strong measures to prevent the virus from spreading, and despite a number of small outbreaks, the situation in China has been calm since last summer.
However, after an outbreak at Nanjing Airport two weeks ago, the coronavirus delta variant has spread to other cities, and more than 400 cases of Covid-19 have been reported in the country. As a result, mass testing of the population and travel restrictions are being carried out in many places.
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