Crown Princess Kiko has tested positive for COVID-19, the Imperial Household Agency said Tuesday.

Her infection was confirmed in a test conducted after she developed a fever on Monday evening, according to the agency.

Crown Prince Akishino, and the couple's children Princess Kako and Prince Hisahito tested negative for COVID-19. Crown Princess Kiko will rest at the family's residence in Tokyo until Saturday.

The couple and Prince Hisahito have been scheduled to visit Kagoshima Prefecture, on Saturday and Sunday partly to attend a national high school culture festival. The Crown Princess will cancel the visit, while Crown Prince Akishino and Prince Hisahito will go to the prefecture as planned if they remain negative for the virus until then, the agency said.

Crown Princess Kiko will also cancel her official duties scheduled for Wednesday and Thursday, including participation in a national event for promoting blood donations in the city of Chiba, near Tokyo.