If you want to quantify the alarming impact of the anti-vaccine movement, the chart above is a good place to start. It plots the cumulative number of new measles cases by month, for each year from 2001 to 2014.
There were 644 new measles cases in 27 states last year, according to the CDC. That’s the biggest annual number we’ve seen in nearly a quarter-century. The vast majority of people who contracted the disease were unvaccinated, including the dozens of cases related to an outbreak at Disneyland in Orange County, California, which is basically Ground Zero in our current epidemic of anti-vaccine hysteria.