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[–]Yayme 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

It's because the antibody test tests for all conronaviruses, not just Covid.

A positive test result shows you may have antibodies from an infection with the virus that causes COVID-19. However, there is a chance a positive result means that you have antibodies from an infection with a virus from the same family of viruses (called coronaviruses), such as the one that causes the common cold.

https://www.cdc.gov/coronavirus/2019-ncov/testing/serology-overview.html

[–]Girlwiththeraventat[S] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Right. This goes along with this article from former director for the Institute of Immunology at University of Bern. He thinks coronavirus is a mutated cold virus that some people already have immunity to. https://medium.com/@vernunftundrichtigkeit/coronavirus-why-everyone-was-wrong-fce6db5ba809