I’m reasonably sure that natural immunity is at least as good as vaccine acquired immunity. The CDC seems to go out of their way to not encourage testing for natural immunity. That’s a mistake… probably an intentional mistake.
On May 1, 2021, the CDC changed the definition of a ‘positive’ case for a PCR test depending on whether the subject is vaccinated. For unvaccinated subjects, the PCR test continued to use the aggressively high cycle threshold of 40+ and if the test came back positive, the unvaccinated patient was considered to have COVID-19, even if they were asymptomatic. However for vaccinated subjects, a positive case was now defined differently — the cycle threshold was lowered (28 or fewer) which meant far less chance for the test to recognize a viral marker. Additionally, if vaccinated subjects were asymptomatic or had only mild symptoms, the tests were now declared to be negative because under the new rules, a vaccinated subject would only be considered COVID-positive, if they were hospitalized or died.
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Stacking the deck, because SCIENCE!