Nobody has ever been vaccinated against plague in developed countries (where the antivax are an issue) and plague hasn't been eradicated through vaccination but prophylaxis. So the gp is both off topic and factually wrong.
Please: plague epidemics were massive outbreaks that lasted a somewhat short amount of time. No diseases of this kind had ever been prevented by vaccination (you just don't have time to develop/distribute a vaccine, think Ebola last time).
Vaccines aren't made for epidemics: they are for _endemic_ diseases, and especially the ones which target children. Vaccines are good for things like polio, smallpox and Measles. But plague, Cholera, SARS, etc. are delt with emergency measures: quarantine, not vaccines.
The problem (and there is indeed a problem) with antivaxs, is child mortality, not «plague-like epidemics».
