Public health officials have confirmed the first U.S. case of a mysterious coronavirus that has sickened hundreds of people in China, the Centers for Disease Control and Prevention said Tuesday.

A Snohomish County, Washington State resident who was returning from China on Jan. 15 was diagnosed with the Wuhan coronavirus, according to the CDC.

Officials said the patient, a male in his 30s, is “very healthy.” He is currently being isolated at a medical center in the state “out of caution” and “poses little risk” to the public, they said. The CDC said the man reached out to local health authorities last week once he started experiencing pneumonia-like symptoms.