Comments by "Theodore Shulman" (@ColonelFredPuntridge) on "Vaccination or natural immunity" video.
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The nearly-final question was why don't we waive the vaccination-mandates for people who already have natural immunity. One obvious problem is that testing for natural immunity is expensive! Even testing for antibody-titers would cost non-trivial amounts of money, and that is a very easy test to run. (Even I can run it.). Add in the cost of counting patients' memory B-cells, memory T-4s, and memory T-8s, and remember: you're not just counting total memory B, T4, and T8 cells; you have to count the number of memory B-cells which target the virus, and the number of memory T4 cells which target the virus, and the number of T8 cells which target the virus. (It's nice for a patient if he has a large number of memory T8 cells which "remember" that he once was exposed to, say, rabies, or Yersinia Pestis, but those cells will not also protect him from SARS-CoV-2, so you need to count only the cells which "remember" his previous exposure to SARS-CoV--2 which gave him the natural immunity.) Counting these cells is much more expensive than antibody-titering (which is why so many scientists rely on antibody-titering even though it doesn't always correlate with total immunity.)
I suppose we could have a policy of waiving vaccination requirements for people who have natural immunity to SARS-CoV-2, but, if you want to apply for the waiver, then you have to pony up the money for the tests. Which will certainly cost more - A LOT more - than just taking the damm vaccine!
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