Covid returns to China's Wuhan after more than a year without a single case
Within 10 days the virus spread from airport workers in Nanjing to almost 30 other cities, including the capital Beijing.
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Residents in virus epicentre Wuhan to be tested to curb Covid outbreak
The residents of Wuhan, the city where the disease was first detected in late 2019, are being mass tested in an attempt to contain an outbreak of the virus.
Covid came from bats via another animal into humans, WHO finds
The study says transmission from bats to humans through another animal is the most likely scenario, with the possibility of a lab leak "extremely unlikely".