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tom66:
Why do you think they do not do studies on natural immunity? Even during the pandemic there was such a thing as a COVID passport, you could go to certain venues if you'd been vaccinated OR had a positive test in the last 6 months and now test negative.  The same policy was used for many countries (e.g. Spain allowed entry on these conditions, I travelled in Feb 2022).

TimFox:
Here is a summary (for general readers) of studies on natural immunity and vaccine immunity for Covid-19, from Johns Hopkins, published in late 2021:
https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-natural-immunity-what-you-need-to-know
A later technical paper (from June, 2022 in the New England Journal of Medicine) on a study of natural and vaccine immunity:  https://www.nejm.org/doi/full/10.1056/NEJMoa2118946
A summary from Cornell of that paper stated: 
"A key finding was that a history of vaccination with the standard two doses of either the Pfizer or Moderna mRNA vaccine, but no history of prior infection, brought no significant protection against symptomatic omicron infection. Having a booster dose appeared to be about 60 percent protective, though most boosters were received just weeks before the omicron wave. Overall, the analysis suggested—consistently with prior studies—that mRNA vaccines and boosters work fairly well in protecting against symptomatic omicron infection, though their protective effect wanes rapidly and disappears within six months or so."

Yes, there have been studies that include natural immunity.
Yet, skeptics will skep...

PlainName:

--- Quote from: Zero999 ---The fact COVID cases haven't started rising exponentially this winter is proof of natural immunity.
--- End quote ---

UK Vaccinations: 50m
UK cases: 20m

I'd say that's more likely due to vaccinations working rather than infections.

wraper:

--- Quote from: TimFox on November 29, 2022, 11:17:47 pm ---Here is a summary (for general readers) of studies on natural immunity and vaccine immunity for Covid-19, from Johns Hopkins, published in late 2021:
https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-natural-immunity-what-you-need-to-know
A later technical paper (from June, 2022 in the New England Journal of Medicine) on a study of natural and vaccine immunity:  https://www.nejm.org/doi/full/10.1056/NEJMoa2118946
A summary from Cornell of that paper stated: 
"A key finding was that a history of vaccination with the standard two doses of either the Pfizer or Moderna mRNA vaccine, but no history of prior infection, brought no significant protection against symptomatic omicron infection. Having a booster dose appeared to be about 60 percent protective, though most boosters were received just weeks before the omicron wave. Overall, the analysis suggested—consistently with prior studies—that mRNA vaccines and boosters work fairly well in protecting against symptomatic omicron infection, though their protective effect wanes rapidly and disappears within six months or so."

--- End quote ---
So point me where in your quote is mentioned efficiency of natural immunity or efficiency of vaccination after prior infection?

--- Quote ---Yes, there have been studies that include natural immunity.
--- End quote ---
More like exclude.

wraper:

--- Quote from: PlainName on November 29, 2022, 11:25:47 pm ---
--- Quote from: Zero999 ---The fact COVID cases haven't started rising exponentially this winter is proof of natural immunity.
--- End quote ---

UK Vaccinations: 50m
UK cases: 20m

I'd say that's more likely due to vaccinations working rather than infections.

--- End quote ---
Correlation is not causation, not to say most of the people already had COVID, often without any symptoms. https://www.washingtonpost.com/health/2022/04/26/majority-americans-coronavirus-infections/

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