Japan's Imperial Household Agency said on Wednesday that 38-year-old Princess Yoko who has tested positive for COVID-19 is suffering from pneumonia.
Princess Yoko, the first member of the imperial family to test positive for the novel coronavirus, was taken to the University of Tokyo Hospital from a hospital within the Imperial Palace's grounds, according to the agency.
Princess Yoko complained of a sore throat and tested positive for the virus on Tuesday, the agency said.
She is the younger daughter of the late Prince Tomohito of Mikasa, a cousin of former Emperor Akihito.