China has reported a rise in new coronavirus infections as doctors in the central city of Wuhan warned its behaviour was still not well-understood.
Tough curbs imposed in China since January have reined in infections sharply since the height of the pandemic in February, although it has spread worldwide to infect 1.6 million people with 100,000 deaths.
But Chinese authorities fear the possibility of a second wave triggered by arrivals from overseas or asymptomatic patients. "We can't say that there is no such potential risk," said Wang Xinghuan, president of Wuhan's Leishenshan hospital, its second built especially for virus patients.