Beijing, March 25 -- China on Wednesday downgraded the risk level of the coronavirus in its epicentre Wuhan from high to medium and resumed bus services within the city for the first time since the nine-week lockdown even as a new study said thousands of positive cases there may have gone under the radar.

China has decided to lift the three-month lockdown on more than 56 million people in the central Hubei province.

However, the prolonged lockdown of Hubei's capital Wuhan will end on April 8, lifting the mass quarantine over the city with a population of over 11 million.

Also, Wuhan will resume commercial flights from April 8, excluding international flights and flights to and from Beijing.

The government has downgraded the risk level o...