SEATTLE — The U.S. on Tuesday reported its first case of a new and potentially deadly virus circulating in China, saying a Washington state resident who returned last week from the outbreak’s epicenter was hospitalized near Seattle.

The man, identified only as a Snohomish County resident is in his 30s, was in good condition and wasn’t considered a threat to medical staff or the public, health officials said.

The virus has infected about 300 people, all of whom had been in China, and killed six. The virus can cause coughing, fever, breathing difficulty and pneumonia. The U.S. joins a growing list of places outside mainland China reporting cases, following Thailand, Japan, South Korea and Taiwan.

Airports around the world have stepped up monitoring, checking passengers from China for signs of illness in hopes of containing the virus during the busy Lunar New Year travel season.

Late last week, U.S. health officials began screening passengers from Wuhan in central China, where the outbreak began. The screening had been underway at three U.S. airports — New York City’s Kennedy airport and the Los Angeles and San Francisco airports. On Tuesday, the U.S. Centers for Disease Control and Prevention announced it would add Chicago’s O’Hare airport and Atlanta’s Hartsfield airport to the mix later this week.

What’s more, officials will begin forcing all passengers from Wuhan to go to one of those five airports if they wish to enter the United States.

The U.S. resident had no symptoms when he arrived at the Seattle-Tacoma airport Jan. 15, but he contacted doctors Sunday when he started feeling ill, officials said. Lab testing Monday confirmed he had the virus.