Heppenheimer
Well-Known Member
The only published papers I could find on this matter don't say quite what you claim.Seems that people are forgetting there are a large? Unknown? number of people that had Covid and are now have immunity to it as well. Studies have recently shown it has the same effect as a vaccine.
Point being is that sole focus on vaccine numbers only only tells part of the story. In all likelihood the amount of people now inoculated against the virus is higher that the just the vaccine numbers.
There are recent numerous articles talking about this. I’m not linking to any of them however as it’s a largely fruitless endeavor with dismissing links (as I’ve learned on this site) if one doesn’t like the source.
As I’m all things YMMV as to whether you like the idea or not but it is an actual thing.
This observational study from Denmark found that prior infection from COVID overall reduced the risk of subsequent infection by 80%. Pretty substantial, but less than most of the vaccines available currently in first world countries. Crucially, though, the reduction in infections for people over age 65 in this cohort was only 47%. The abstract, though, doesn't mention the severity of the re-infection.
This study from the UK looked at the question from a slightly different angle, but found similar results. Prior infection was 84% protective against re-infection:
SARS-CoV-2 infection rates of antibody-positive compared with antibody-negative health-care workers in England: a large, multicentre, prospective cohort study (SIREN) - PubMed
Department of Health and Social Care of the UK Government, Public Health England, The National Institute for Health Research, with contributions from the Scottish, Welsh and Northern Irish governments.
pubmed.ncbi.nlm.nih.gov
Again, pretty good, but substantially lower than immunity generated by the vaccines. This study was performed on hospital workers, so the cohort above age 65 was probably substantially lower than the Danish study.
But just like we don't know the duration of immunity from the vaccines yet, we also don't know how long natural immunity will last. And the question of protection from variants is also not yet known.
The most helpful hypothetical study would be one that compares protection from infection via vaccine versus prior infection during a single surge. But I couldn't find one that answers this question, and given the increasingly high rates of vaccination in the OECD countries, we may not see such a study.