I just recently read a similar article. It was said (paraphrasing) ... Do humans get vaccinated for the same diseases over and over again?
Give it time. As it is, they want everyone to get a flu shot every year (since the virus mutates, but they take an educated guess about the mutation for the year's vaccine), and they're finding some vaccines like whooping cough may need a "booster" after, say, 10 years since these diseases are coming back (of course, they also blame the anti-vaccine movement for that, too). The thing is, they may think the first vaccine just wore off, but the reality is that viruses and bacteria mutate. If they're still using the same vaccine strain from 40 years ago (and I think some of the vaccines are still using old strains), they may not be as effective as they used to be because the virus mutated.
But just wait for it. They will start telling everyone to get re-vaccinated for things like MMR, whooping cough, chicken pox, etc.
Sorry, I digressed . . .