Helen Down holds her 14-month-old daughter, Amelia, for an MMR shot in Swansea, Wales, April 2013. The vaccination was in response to a measles outbreak. Geoff Caddick/AFP/Getty Images hide caption
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Amish show up at a makeshift clinic to get vaccinated against the measles. There's been an outbreak of measles among the Amish in central Ohio. Sarah Jane Tribble/Sarah Jane Tribble hide caption
Measles Outbreak In Ohio Leads Amish To Reconsider Vaccines
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Measles was brought to Ohio's Amish communities by people returning from mission trips to the Philippines. Chuck Crow/The Plain Dealer/Landov hide caption
There today, here tomorrow: A mother holds her child for a measles vaccination in Manila, Philippines, in January. Travelers are bringing measles from the Philippines to the United States. Noel Celis/AFP/Getty Images hide caption
Potent but not perfect: Medical assistant Elissa Ortivez prepares a measles, mumps and rubella vaccine at a clinic in Walsenburg, Colo. John Moore/Getty Images hide caption
This one's virus-free: Matthew Followill, Nathan Followill and Caleb Followill of Kings of Leon performed in Los Angeles in December. Kevin Winter/Getty Images for Radio.com hide caption
A boy waits to get vaccinated at an anti-polio campaign in Moradabad, India. Michaeleen Doucleff/NPR hide caption
The Eagle Mountain Church in Newark, Texas, was linked to at least 21 cases of measles this year, mostly in children. LM Otero/AP hide caption
Luke Tanner, 7, gets vaccinated for measles at a clinic near Swansea, Wales, in April. Wales is at the center of a measles outbreak that has been linked to one death. Geoff Caddick/AFP/Getty Images hide caption