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Quiz: How much do you know about vaccinations?

Within the last 15 years, vaccine programs have saved approximately six million lives. And, even better, vaccines are relatively inexpensive – it only costs $23

Shakeithia Roberts holds her son as a pediatrician administers a measles vaccination during a visit to the Miami Children's Hospital on May 16, 2014.
Shakeithia Roberts holds her son as a pediatrician administers a measles vaccination during a visit to the Miami Children's Hospital on May 16, 2014.Getty Images

MS NOW staff