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Number and percentage of measles cases that were directly imported and number of cases that were not directly imported* — United States, 2001–2013†
* Directly imported cases are those in patients who acquired measles outside the United States and brought their infection into the United States. Cases not directly imported include those that were acquired in the United States but linked to directly imported cases, imported virus, and cases with unknown sources.
† As of Aug 24, 2013.
