Why have there been more measles cases in the United States in recent years?

In 2008, 2011, 2013 and 2014, there were more reported measles cases compared with previous years. CDC experts attribute this to:

·       More measles cases than usual in some countries to which Americans often travel (such as England, France, Germany, India, the Philippines and Vietnam), and therefore more measles cases coming into the US, and/or

·       More spreading of measles in U.S. communities with pockets of unvaccinated people.

For details about the increase in cases by year, see the CDC’s Measles Outbreakspage.