MMR — the modern combination vaccine against measles, mumps and rubella — provides stronger, longer-lasting protection against measles than the stand-alone measles vaccine typically given in the U.S. in the early 1960s.
The multistate measles outbreak in 2015 led pediatricians in Scottsdale, Ariz., to warn patients they might be exposed during office visits. The state's medical associations oppose legislation that would make it easier for parents to opt out of school vaccinations for their kids.
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