The reason I ask is because our bodies as human beings have an amazing immune system and unless you have an autoimmune disease, naturally our bodies can heal ourselves from sickness.
I’m speaking primarily on the common cold, Influenza or anything similar like it, including even COVID.
If “natural immunity” is playing a sport and winning against an opponent (pathogens), then vaccination is practicing beforehand.
And this is not a game you want to lose.
Yup, not taking the vaccine is like playing rock paper scissors for your life; heck, even if you win your opponent might leave you with a parting gift.