The Japanese imperial family confirmed its first case of coronavirus infection Tuesday, with 38-year-old Princess Yoko hospitalized, Japaneses media reported.

Japan's Princess Yoko of Mikasa is the younger daughter of the late Prince Tomohito of Mikasa, a cousin of former Emperor Akihito.

She had a sore throat Monday and tested positive for the virus on Tuesday. She's now being treated at a hospital inside the Imperial Palace.

Her sister, Princess Akiko, whom she met several days ago, will also be tested.