Useful Vaccinations

[Highlander]

If Cholera and Typhoid are free, does anyone know how long they last for, and when it does expire, is it another full jab, or simply a boaster.

I am just thinking about small medical practices like ours where everyone knows everyone else,.. we could say we want them because we are thinking of a holiday in Africa, but that wouldn't work if we needed a jab every year