How does anyone know if they have natural immunity or not?
Get an antibody test. I had Covid in January, and last month I got tested for antibodies. Fifty-five times the minimum value they look for. Had it done at Labcorp for $10.
The natural immunity conferred by having contracted the Chinese virus and recovered should last decades. Antibody testing is a short term thing, it won’t necessarily show the antibodies for more than a few months. I think they have to test for certain T and B cells or somesuch. This is the body “memory” of the specific virus, and is ready in reserve should it be exposed again down the road.
Why they are playing these games is inexplicable. If someone has natural immunity, it is not necessarily a good idea at all to take that particular vaccine. Why take the chance? The Chinese virus can really screw people up, but then, so can the vaccine.