Japan confirmed its first case of monkeypox Monday, with the news coming on the same day that the nation stepped up preparations for an outbreak following the World Health Organization*s declaration over the weekend that the viral disease constitutes a global public health emergency.

The patient is a Tokyo resident in his 30s. In late June, he traveled to Europe, where he had contact with someone who was later diagnosed with monkeypox, before returning to Japan in mid-July, a health ministry official said.

The man first developed a sense of fatigue on July 15. He visited a doctor in Tokyo on Monday, complaining of a fever, rash and headache in addition to the sense of fatigue, the official said. The patient is currently being treated at a hospital in Tokyo and is in a stable condition.