Are you saying that there are people - lots of people - who will not be infected with covid if they are exposed to it? That seems to me to be what you are implying. That would be news to me.
Also since you asked the answer yes, it appears many people with T cells from previous coronavirus many time do have a pre existing natural immunity.
“Importantly, we detected SARS-CoV-2-reactive CD4+ T cells in ∼40%-60% of unexposed individuals, suggesting cross-reactive T cell recognition between circulating "common cold" coronaviruses and SARS-CoV-2.”
Long ago - in covid years - the original version of the virus gave better protection than vaccination against getting reinfected. These days getting vaccinated after surviving the virus and full recovering provides better protection against reinfection, and at the same time it reduces the load on the healthcare system so that people who need care for their unavoidable health problems have a better chance of getting the help they need.
Clicking on the link you supplied does not produce a web page with that phrase or even just the words "natural immunity" by themselves.
Anyone can check it.
And you didn't answer the question: Doesn't a positive PCR test mean you have covid?
Jesus Christ, click the title link and it’s in the first paragraph.
Fuck
Why would I play your games when you’re still lying about natural immunity
Are you saying that there are people - lots of people - who will not be infected with covid if they are exposed to it? That seems to me to be what you are implying. That would be news to me.
Also since you asked the answer yes, it appears many people with T cells from previous coronavirus many time do have a pre existing natural immunity.
“Importantly, we detected SARS-CoV-2-reactive CD4+ T cells in ∼40%-60% of unexposed individuals, suggesting cross-reactive T cell recognition between circulating "common cold" coronaviruses and SARS-CoV-2.”
https://pubmed.ncbi.nlm.nih.gov/32473127/
That's from 2020 Jun 25. Long before the Alpha, Beta, Gamma, Delta, and Omicron variants.
you want to bar people from society even though they have a superior immunity to those who can move freely
It’s evil
Long ago - in covid years - the original version of the virus gave better protection than vaccination against getting reinfected. These days getting vaccinated after surviving the virus and full recovering provides better protection against reinfection, and at the same time it reduces the load on the healthcare system so that people who need care for their unavoidable health problems have a better chance of getting the help they need.