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The FDA recently sent out a communication to remind people that the results from antibody testing should not be used to evaluate a person's immunity or protection from COVID-19 after vaccination or after a natural infection. The CDC also does not recommend antibody testing after vaccination to assess for immunity. There is no recommendation on re-vaccination or giving additional doses of vaccines (as this is a frequent question for those who are immunocompromised), but with more
information there may be additional recommendations at some point.