NPR

How Did We Get Here? 7 Things To Know About Measles

The U.S. is in the midst of a record-breaking measles epidemic. What brought us here, who is most at risk and what do you need to know now?
Measles vaccination rates need to be at 93% to 95% to keep herd immunity. Otherwise, very young infants or other vulnerable people can be exposed to the virus.

Americans could be forgiven for not knowing that much about measles. After all, it's been 51 years since an effective vaccine was introduced, quickly turning the disease from a common childhood experience to a rarity, and nearly two decades since the disease was declared eliminated from the U.S.

But outbreaks have surfaced throughout the country over the past few months, affecting more than 700 people.

Most of the cases are linked to people who have traveled abroad — to countries where measles is more common — or spread within insular and close-knit communities,

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