Health officials in China have published the first details of more than 44,000 cases of Covid-19, in the biggest study since the outbreak began.
Data from the Chinese Centre for Disease Control and Prevention (CCDC) finds that more than 80% of the cases have been mild, with the sick and elderly most at risk.
The research also points to the high risk to medical staff.
A hospital director in the city of Wuhan died from the virus on Tuesday.
Liu Zhiming, 51, was the director of the Wuchang Hospital in Wuhan – one of the leading hospitals in the virus epicentre. He is one of the most senior health officials to die so far.
Hubei, the province Wuhan is in, is the worst affected province in the country.