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 (CDC) 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.

"We're being proactive at all levels," Nancy Messonnier, CDC's director of the National Center for Immunization and Respiratory Diseases, said on a conference call with reporters Tuesday. "CDC will be working closely with the state health department on the particulars of this patient's care."

President Donald Trump on Wednesday told CNBC he was aware of the case and said the U.S. has it "totally under control."

"We have it totally under control," Trump told "Squawk Box" co-host Joe Kernen in an interview from the World Economic Forum in Davos, Switzerland. "It's one person coming in from China. We have it under control. It's going to be just fine."