Japanese Prime Minister Abe Shinzo has returned to work after undergoing medical checks at a Tokyo hospital.
Abe broke a record on Monday, becoming the longest-serving Japanese leader in terms of 2,799 consecutive days in office.
A huge Olympic rings monument in Tokyo Bay has been temporarily removed for safety checks.
The floating monument is 33 meters wide and 15 meters high. It was installed in January on the water in Odaiba Marine Park, one of Tokyo's Olympic venues.
Yamagata Prefecture in northern Japan has launched its own anti-coronavirus measures targeting people coming from other prefectures.
Local officials on Saturday began checking temperatures of visitors at seven locations, including a key train station, an airport and a parking area near the border with Miyagi Prefecture.
Japan's Health Ministry will continue to check the condition of passengers who got off the quarantined cruise ship docked near Tokyo, after one of them tested positive for the new coronavirus on Saturday.
Nine hundred sixty-nine passengers left the Diamond Princess last week after testing negative for the virus and finishing the two-week quarantine period.