State health officials said 55 new cases had been reported since Wednesday. In all, 890 measles cases have been reported across 39 counties so far this year.
A vaccine clinic in New Holland, Pa. An outbreak of measles in Pennsylvania has led to four deaths so far this year, according to the State Health Department.
As the outbreak grows to more than 700 confirmed cases, the largest in the country, some people remain opposed to vaccines and others are rushing to get the shots.
Hunger and disease have tormented Yemen for years. Now, fighting between the Saudi-backed government and Iran-backed Houthis is pushing it to the brink.
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