Don’t Use Antibody Tests Post Vaccine to Determine Immunity – mercola.com

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Antibodies are proteins your body makes in response to infections and will be detectable in your blood after infection as a sign of your body’s battle against that pathogen. Antibodies for COVID-19 are believed to develop within one to three weeks after infection, and a positive antibody test for COVID-19 means that a person may have been infected with SARS-CoV-2, the virus that causes COVID-19, in the past.1

 

Titer blood tests, which measure the presence and amounts of certain antibodies in your blood, are sometimes used to prove immunity to a disease.2 If your titer is positive, which means it’s above a set value, you’re considered to be immune to the disease, such as measles, mumps or rubella.3

 

This is why, for instance, proof of prior diagnosis with chickenpox, measles and mumps is allowed instead of vaccination to enter most U.S. public schools4 — once you’ve had the disease and recovered, you’re immune.

 

In the case of COVID-19, however, the U.S. Food and Drug Administration issued a safety communication in May 2021,5 warning both the public and health care providers not to use SARS-CoV-2 antibody tests to gauge immunity, especially among people who’ve received a COVID-19 vaccine.

 

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