Negative GR:
The results suggested that immunity from getting the virus and still being unvaccinated is a lot better than never having been infected and getting two pfizer shots.
If your first exposure to virus immunity was 6-9 months ago (real virus or vaccine), you're 13x more likely to get infected by the Delta variant if you had the two shots and never had the virus. And more likely to develop covid in that group.
If you had the virus any time in the past 16-19 months and you're unvaccinated, your immunity is not as strong anymore but you'd still be 6x less likely to get infected again and 7x less likely to develop covid than if you had the two shots (in the past 6-9 months) and never had the virus. And less likely to be hospitalized.
And without statistical significance, they think that having had the virus followed by a single shot gives slightly better immunity than the natural one from prior infection. Again, much better than never having been infected and getting the two shots.
No data on third shot immunity yet.
So, for those who had the virus and didn't get the vaccine, you might be in a great position right now. Biologically speaking, at least...