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. After several visits to the doctor, she was tested a week later and tested positive again. Prefectural officials believe that either viruses that remained in the woman multiplied, or the woman was re-infected.

Source: The Standard February 27, 2020 02:48 UTC