The CDC is warning against using commercial tests to determine immunity.
But scientists are still searching for a so-called"correlate of protection" -- a marker in the blood that would reliably indicate protection. And they don't necessarily think it's antibodies. That means the presence of antibodies -- or even more specific antibody levels -- does not necessarily correlate with a person's level of protection.
The Food and Drug Administration strongly warns against antibody tests as a way to check for immunity among people who are fully vaccinated, writing in May that"currently authorized SARS-CoV-2 antibody tests should not be used to evaluate a person's level of immunity or protection from COVID-19 at any time, and especially after the person has received a COVID-19 vaccination."
"What we generally think is that all of the vaccines get you to high-enough levels where even if they wane, you're still protected against hospitalization," Ellerin said."Because the vaccines have done such a great job, all of them, at preventing hospitalizations, we think, based on some of the modeling studies, that you only need 3% of your average neutralizing antibody response to keep you out of the hospital.
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