Officials of Osaka Prefecture, western Japan, say a woman in her 40s, who had been treated for symptoms of the new coronavirus and left hospital early this month, has again tested positive.
The woman is a tour guide living in the city of Osaka.
She was on a bus carrying tourists from Wuhan, China, in mid-January, and tested positive on January 29.
The woman was discharged from a local medical institution on February 1, and was confirmed as virus-free on February 6.
But on February 19, she felt throat and chest pain. After several visits to the doctor, she was tested a week later and tested positive again.