U.S. measles cases more than double what they were last year as outbreak spreads
Pennsylvania is the worst hit state, with at least 1,338 cases of measles confirmed in 44 counties so far this year, according to the Pennsylvania Department of Health.
Pennsylvania is the worst hit state, with at least 1,338 cases of measles confirmed in 44 counties so far this year, according to the Pennsylvania Department of Health.
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