>>17098072since the dawn of time
the tetanus shot requires a booster every ten years
flu shots are renewed every year
If you have a cat it likely gets a FVRCP every year.
The smallpox vaccine had a 3 year booster, though people often still got smallpox within that 3 year window, just without scarring lesions and with a almost 99% reduced chance of death.
This study considered anyone with the original 2 vaccines and the first booster fully vaccinated.
