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