In this Nov. 26, 2013 file photo, Red Cross and UNICEF medics administer polio and measles vaccinations to children at an evacuation center for typhoon survivors more than two weeks after Typhoon Haiyan ravaged the city of Tacloban, Leyte province in central Philippines. Measles cases in the last five months have caused more U.S. illnesses than in any entire year since 1996, according to numbers released by the Center for Disease control and Prevention on Thursday, May 29, 2014.
In this Nov. 26, 2013 file photo, Red Cross and UNICEF medics administer polio and measles vaccinations to children at an evacuation center for typhoon survivors more than two weeks after Typhoon Haiyan ravaged the city of Tacloban, Leyte province in central Philippines. Measles cases in the last five months have caused more U.S. illnesses than in any entire year since 1996, according to numbers released by the Center for Disease control and Prevention on Thursday, May 29, 2014. ASSOCIATED PRESS
In this Nov. 26, 2013 file photo, Red Cross and UNICEF medics administer polio and measles vaccinations to children at an evacuation center for typhoon survivors more than two weeks after Typhoon Haiyan ravaged the city of Tacloban, Leyte province in central Philippines. Measles cases in the last five months have caused more U.S. illnesses than in any entire year since 1996, according to numbers released by the Center for Disease control and Prevention on Thursday, May 29, 2014. ASSOCIATED PRESS

Worst U.S. measles outbreak in 20 years is due to overseas travel

May 29, 2014 01:33 PM

UPDATED May 30, 2014 06:51 AM

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