My own doctor used the hydroxy/zinc/azithromycin cocktail on himself when he caught it. He was staunchly anti-clot-shot. Recommended that I go out and catch it, and he would do it for me. I being 75 at the time, overweight and diabetic, natural immunity was the best course for me, he said. I failed. Never did catch it.
Au contraire.
If you never 'caught it' then you have natural immunity. You don't have to catch it and fight it off to have immunity. Some people just don't easily catch diseases.