Vaccinating is literally training the immune system to look for a specific protein and treat it as a threat. When your immune system learns how to fight off a

Vaccinating is literally training the immune system to look for a specific protein and treat it as a threat. When your immune system learns how to fight off a virus, it does it by creating antibodies for a specific protein - treating that protein as a threat. They're effectively the same thing. The only thing the vaccine does differently is it doesn't exponentially reproduce in your cells. So anyone who survived Covid by definition has an immune system which can recognise the virus and attack it. Otherwise they wouldn't have survived.