See my post, here...about possible natural immunity.
https://freerepublic.com/focus/chat/3932102/posts?page=60#60
It’s an actual, first hand example, that I know of.
There are not studies. What I do know is that for every other virus once you get it you are immune. This is a member is the Corona virus family. Other Corona virus infections get to T cell immunity. I do not believe this is different than any other virus.
The advice of J&J is based on a gut felling of you will. Those who havenโt had it should proceed with Pfizer or Modena as it has been shown 95% effective and able to get to T cell immunity after second injection.
Knowing that there are monoclonal antibodies and if I had the disease I would probably not be vaccinated. This is an opinion only. But it comes from my training in medical school snd my judgment that this virus is not setting 100 years of immunology theory on its head.