That's a huge assumption in this Covid world (but but but Fauci said it, so it must be true). I would love to see the "scientific" double blind testing of that. Are the unvaccinated assumed to only be passing it along to the unvaccinated, or do they also pass it along to the vaccinated? At what rate would it be assumed that the vaccinated "typically" pass it on or not. If the vaccinated can test positive, then they can also pass on that same saliva, mucous, or airborne particles that contained those positive traits to cause others to test positive.
When Pfizer came out with their vaccine and reported that it was 95% effective against the virus, I wondered........how on earth do they logically test that. They'd have to put all 40k test subjects (the number Pfizer reported for their vaccine testing) in an enclosed room and pump the virus in for a few days and then retest all those subjects for several days to show that only 2k of the 40k tested positive for a 95% effective rate. But they'd still have to do the same test again on another 40k test subjects to make sure the first group wasn't a fluke. I'm not sure they could ever get even the first 40k "volunteers" for all that.
But then they'd have to also do the exact same testing with unvaccinated subjects without antibodies........and another whole group of unvaccinated but with natural antibodies to really show all the effects, probabilities, and percentages.
Then after all that, NOW they'd have to do similar testing but with "transmissibility" between the different groups as the test. Then they'd have to do the same testing with each variant........and with each booster.......etc. Man that's a lot of testing......would probably take years to get all that done. Or even longer to find that many people to voluntarily subject themselves to such a dangerous virus.
I guess the experts are all assuming that all these vaccinated NFL players on the same teams just randomly got the virus from all unvaccinated people outside of their vaccinated close contacts. "roll eyes" I'll stick with logic and reason over listening to the talking heads that have contradicted themselves over and over at this point.