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The record number of measles cases in the U.S. so far this year has topped 4,000, the CDC reported Friday.
Most states and Washington, D.C., have reported cases of the contagious disease. cbsn.ws/4hR7jqC
Most states and Washington, D.C., have reported cases of the contagious disease. cbsn.ws/4hR7jqC
cbsnews.comU.S. measles cases top 4,000, far surpassing last year's total, CDC says
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