Scientists have been very open about “natural” immunity.
Don’t know of any that deny it’s obvious affect.
I asked about being able to get an antibody test to show that I had and recovered from the virus back in January of 2020, and therefore do not need to take the jab. The Doctor as well as other local medical people told me that won’t work because the antibodies only last a couple of months. I would like to find definitive research facts to show them that they are wrong.