Tokyo is under a fourth state of emergency, which began Monday and requires restaurants and bars to close early and not serve alcohol through the Olympics, which start July 23.
Tokyo Gov. Yuriko Koike noted that the largest increase in serious cases and hospitalizations was among people in their 50s and younger who are largely unvaccinated. She expressed concern about the impact on the medical system as infections are propelled by the more contagious delta strain of the virus.
“We need to stay on alert,” Koike said, urging people to minimize outings and stick to basic anti-infection measures “to overcome this very difficult situation.”
New daily cases have been steadily climbing since mid-June and experts say they could hit several thousand during the games.
Due to the state of emergency in Tokyo and a fear of infections accelerating during the games, organizers last week decided to bar fans for most events, except for limited numbers at outlying locations.
Overall, Japan has had about 828,000 confirmed cases and 15,000 deaths.
Dr. Masataka Inokuchi, a medical adviser for a Tokyo metropolitan government panel, said Thursday he is worried that younger people may celebrate and party because of the Olympics, further accelerating infections.