
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.
Within 10 days the virus spread from airport workers in Nanjing to almost 30 other cities, including the capital Beijing.
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.
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".