BEIJING — France confirmed three cases of coronavirus Friday, marking the first confirmed diagnoses in Europe, as China expanded its efforts to control its outbreak and announced 15 new deaths. Australia also confirmed its first case of coronavirus, and a second case was confirmed in the United States.

Travel bans were extended in central China to put tens of millions of people effectively on local lockdowns. In Wuhan, where the virus was first detected, workers are racing to build a 1,000-bed hospital to treat victims of the disease.

Authorities around China, including in the capital, Beijing, have canceled the temple fairs and festivals that accompany the Spring Festival to avoid having large public gatherings where the airborne virus could spread.

● There are at least 1,287 confirmed cases of infection, and at least 41 people have died. A total of 8,420 people are reported to be under observation.

● A young, previously healthy man died in Wuhan, raising concerns about the deadliness of the virus. Until now, the vast majority of victims have been older than 60 with preexisting conditions.

● Infections have been confirmed in Australia, France, South Korea, Japan, Nepal, Thailand, Singapore, Vietnam, Taiwan and the United States.

● Authorities are enforcing a lockdown across large parts of the province of Hubei, affecting more than 35 million people, but the precise number remains unclear.

● The Chinese medical system has clearly struggled to cope with the outbreak, with reports of crowded hospitals, stressed doctors and dwindling supplies.