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I don't think you people understand the definition of immunity. You can get a virus and fight it off or you can get a vaccine. Your body produces anti-bodies and T-cells while fighting it off or from recognizing the inactivated/modified virus. Your body remembers what the virus looks like and files it under "do not let this person patronize this store".
Immunity doesn't mean there's suddenly an invisible force field surrounding you blocking that specific virus from entering your body. You can still have the same virus or a mutated version enter you and cause symptoms, but the hope is your body's immune system kicks in and knocks that shit out before it causes real damage.
That's just my layman's understanding. A real medical professional can vet what I just said.
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