Princess Kako, the niece of Japanese Emperor Naruhito, has tested positive for COVID-19, the Imperial Household Agency said Sunday, Report informs via Kyodo News.

The younger daughter of Crown Prince Fumihito and Crown Princess Kiko canceled her attendance at an event in Tottori Prefecture, western Japan, the same day. She will recuperate at a hotel in the prefecture through Thursday, the agency said.

The 28-year-old princess felt discomfort in her throat on Saturday night. She developed a fever on Sunday morning and tested positive for the coronavirus, it said.