There are a couple of factors that could make Olympic travelers much more likely than the general non-Olympic traveler to contract or spread the virus.
1. The Olympics venues are in places that have been particularly hard hit by the virus.
2. Much of those non-Olympic travelers are business travelers on short visits. Olympic visitors will typically visit for longer. Risk of infection should go up as length of stay goes up.
3. The virus can be sexually transmitted between humans. I'd expect that Olympic visitors have a higher probability than the average visitor of engaging in sex during their stay.
It's not the full set of hundreds of thousands of people that fly in and out of Brazil each day that you should be comparing against, but rather the subset of those that are there for vacations lasting at least a week or two.
1. The Olympics venues are in places that have been particularly hard hit by the virus.
2. Much of those non-Olympic travelers are business travelers on short visits. Olympic visitors will typically visit for longer. Risk of infection should go up as length of stay goes up.
3. The virus can be sexually transmitted between humans. I'd expect that Olympic visitors have a higher probability than the average visitor of engaging in sex during their stay.
It's not the full set of hundreds of thousands of people that fly in and out of Brazil each day that you should be comparing against, but rather the subset of those that are there for vacations lasting at least a week or two.