Your immune systems T-cells form a long term memory. Any future contact with these viruses will cause your CD8 "Killer" T-cells to go on a rampage and immediately BTFO any of these viruses which enter your body.
Most of us will be exposed to them throughout life which acts as a natural booster. I had chickenpox as a kid. I was likely exposed again from younger kids in school when there was an outbreak and at various times as people I know have school aged kids which themselves get it and expose you. You then become a parent - get exposed from your kids numerous times. Then probably get exposed again as a grandparent.
Your immune systems T-cells form a long term memory. Any future contact with these viruses will cause your CD8 "Killer" T-cells to go on a rampage and immediately BTFO any of these viruses which enter your body.
Most of us will be exposed to them throughout life which acts as a natural booster. I had chickenpox as a kid. I was likely exposed again from younger kids in school when there was an outbreak and at various times as people I know have school aged kids which themselves get it and expose you. You then become a parent - get exposed from your kids numerous times. Then probably get exposed again as a grandparent.