RW> What numbers will I give for natural immunity when they aren�t reporting on them?
It may be google’s fault that you can’t find the numbers (not kidding). Google adapts their algorithms to what you click on – so you get Reuters, and I get Lancet… Here is what I found (all is for pre-Delta):
PCR-based infected people are 80% protected against re-infection, 47% for those over 65. Does not decrease at 6-7 months. [1] similar 83% result for UK medical personnel [2]. comparisons are in both cases with uninfected unvaccinated people with the same demographics. So, other than with older people, previous infection is close to vaccines.
Kentucky residents with previous infections: those of them who were unvaccinated had 2.3 more infections compared with those who were fully vaccinated [3]. So, vaccination provides additional benefit to those who were previously infected
[1] Hansen Assessment of protection against reinfection with SARS-CoV-2 among 4 million PCR-tested individuals in Denmark in 2020: a population-level observational study, Lancet, March 2021
[2] V Hall Do antibody positive healthcare workers have lower SARS-CoV-2 infection rates than antibody negative healthcare workers? preprint
[2] Alyson M. Cavanaugh, Reduced Risk of Reinfection with SARS-CoV-2 After COVID-19 Vaccination � Kentucky, May�June 2021