I’m sure you’ve heard the rhyme, “an apple a day keeps the doctor away.” Unfortunately, this rhyme is not entirely truthful. Apples are healthy and good for you in many ways, but the reality is, eating an apple can’t keep you from getting sick. There is something that can do that though—vaccination (although we have yet to invent a rhyme reminding us of that).
Vaccinations are arguably the most important contribution to medicine. They are the reason polio no longer exists in the United States and why children no longer even need inoculation from small pox.