And why do I need proof I developed antibodies against COVID-19 coronavirus when the seasonal flu is more harmful, that is according to what the Centers for Disease Control says.  Some 36,000 deaths from influenza every flu season and supposedly only 12,000 deaths from coronavirus this year.

How about my influenza papers, and chicken pox papers, and polio papers, and tuberculosis papers given that migrants in the U.S. spread TB bacterium all over America?

And I'm sure you are talking about proof of having sufficient antibodies from natural exposure to COVID-19 coronavirus, but even antibodies won't ensure you won't get the disease again.  I don't have to inform you about that as you are the preeminent infectious disease specialist in the US being in charge of the National Institute of Infectious Diseases, so I hope I'm not educating you about that.