[bigstrat2003]

I'm not the same person. But a vaccine which doesn't actually provide lasting immunity is a really shit vaccine. And while I wouldn't say that means it doesn't deserve to be called a vaccine at all, certainly many people think that.

[op00to]

No, it’s not. The tetanus vaccine saves lives and must be redone every so often. The cholera vaccine as well. There are many excellent vaccines that save lives that require boosters.

[PhasmaFelis]

Yearly flu vaccines have been a thing for decades.

If that's what OP thinks, I'm not sure they actually know what a vaccine is.