re: As of 5/06, there are 764 known cases of Measles in 23 states

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What about the other Central American countries from which many of the immigrants originate?

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From the article linked by the poster below your post...

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However, vaccination rates in the countries of El Salvador, Guatemala and Honduras are above 90 percent, according to the Centers for Disease Control and Prevention.

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U.S. is barely 91% for certain vaccines(and that is the highest number...they are lower for others)

LINK