We know the vaccines out there reduce the spread of Delta COVID-19. They do not eliminate spread; they reduce it. We know this because of simple math. /1
If the vaccine did not stop COVID spread at all, we would expect the number of new cases to be directly proportional to the number of unvaccinated people. That’s *not* what we’re seeing. I will give just two datapoints. /2
MA has about 28% unvaccinated, and 9.5 new cases per 100,000 population per day. FL has about 44% unvaccinated, and 75 cases per 100k population/day. So, getting vaccinated protects you and protects those you contact, not perfectly, but it does reduce spread. /3
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