We Never Know
No Slack
I would suppose that those who have had Covid are better protected. It would be interesting to find out how many Omicron patients had Covid before.
I don't know about that. At Cornell with a vax rate around 97-98%, over 900 new cases and virtually all omicron cases are in vaccinated people even some with boosters. The vaccine isn't a golden shield that keeps people from getting it or spreading it.
It wouldn't be a bad thing if more unvaccinated got vaxxed and the already vaxxed come to the realization they can still get it and spread it like the unvaxxed.