The scale of the Covid-19 outbreak in Wuhan early in 2020 may have been nearly 10 times the recorded tally, a study conducted by China’s public health authorities indicates, leaving the city where the coronavirus first took hold still well short of the immunity required to protect it against a potential resurgence.

About 4.4% of those tested were found to have specific antibodies that can fight off the pathogen that causes Covid-19, indicating they were infected sometime in the past, according to a serological survey of more than 34,000 people conducted in April by the Chinese Centre for Disease Control and Prevention (CDC). The data was released late on Monday...

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