In reply to Misha:
> Thing is, the Japanese organisers have said that they'll pull the games if there isn't a vaccine by next summer.
But it's got to be doubtful, even with a vaccine by next summer. No vaccine will be 100% reliable. And they'd have to insist that every competitor, coach, official etc, plus media and tourist attendees have been vaccinated sufficiently in advance (impossible?) and then quarantine them all for 14 days before the games (impossible?), to not risk another wave. `Behind closed doors' is a possibility, but that only removes the crowd, not the hundreds/thousands of competitors etc etc.