Smallpox is eradicated and nobody is getting vaccinated for it anymore. It is not worth the hassle, expense, and indeed the very small danger of negative effect

Smallpox is eradicated and nobody is getting vaccinated for it anymore. It is not worth the hassle, expense, and indeed the very small danger of negative effects. I and the people I know get boosters for more common diseases (measles for instance) every 10 or 20 years.