Public health experts have discussed anti-coronavirus safety measures for the Olympic Villages ahead of the Games.
The organizers and the IOC have set guidelines for ensuring the safety of all residents in the village, while balancing considerations related to the athletes' performances.
Athletes and officials are required to receive daily tests. Other guidelines mention about eating manners at the villages.
The experts cited the need for enough space for self-isolation in case infections occur. They also called for measures to shorten waiting times at clinics and to avoid overcrowding in dining halls.
Not only athletes, but also sports fans could have a potential risk for spreading infections.
The Tokyo metropolitan government plans to set up six locations for public viewing in the capital. One expert said such sites may need to caution participants.
Saito Tomoya at National Institute of Infectious Diseases said, "Creating places for fans to gather means a possible increase in the flow of people. Based on what we have experienced so far, this could be a potential risk for spreading coronavirus."
Meanwhile, Tokyo Governor Koike Yuriko said another postponement of the Games would be difficult.
She said, "Basically, I think the Games will be completely different if postponed, and the athletes may change their motivation and physical preparations."
The president of the Tokyo organizing committee, Hashimoto Seiko, said the number of domestic spectators will be decided after the state of emergency is lifted. International spectators have already been banned.
The president of the International Olympic Committee told athletes on Thursday to come to Tokyo with confidence.
Thomas Bach said Tokyo is the best prepared Olympic city ever. Previously, he had said about 80 percent of athletes are expected to be vaccinated and urged all the Olympic athletes to get their shots if possible.