Percentage of unvaccinated people who become infected after their first exposure to measles, Allison Bartlett of the Comer Children’s Hospital infection control program told UChicago Medicine’s ScienceLife: 75

Before the 1967 introduction of the measles vaccine, the average number of annual deaths from the disease in the United States: 500

Percentage reduction of measles cases in the United States after the introduction of the vaccine: 99

Deaths per 1,000 US children infected with measles: 3

Current number of global cases per year, in millions, according to the Centers for Disease Control: 20