Antibody test

Antibody test

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 * 20 May 2021, ECDC, The use of antibody tests for SARS-COV-2 in the context of digital green certificates, A positive antibody test result can be proof of a past (including recent) infection, without providing any indication of the time of infection, and cannot exclude a current ongoing infection. Therefore, is not an absolute proof that a person is not infectious and/or protected against a new infection and cannot transmit the virus further. The tests that target the spike protein will be unable to distinguish between people who have been previously infected and those who have received at least one dose of the vaccine.
 * 17 Mar 2021, CDC.gov, Interim guidelines for covid-19 antibody testing, Antibody testing is not currently recommended to assess for immunity to COVID-19 following COVID-19 vaccination or to assess the need for vaccination in an unvaccinated person. Since vaccines induce antibodies to specific viral protein targets, post-vaccination serologic test results will be negative in persons without history of previous natural infection if the test used does not detect antibodies induced by the vaccine.