In the United States, the first case of Wuhan coronavirus was confirmed Tuesday in Washington state, when a man in his 30s who is under observation stoked fears of an outbreak in that country.
Coronaviruses cause diseases in mammals and birds that include diarrhea in cows and pigs, upper respiratory disease in chickens and rare, but potentially lethal, human respiratory infections.
There are no vaccines or antiviral drugs approved for prevention or treatment.
