The trend in measles cases is troubling, but to call it a "roaring" comeback is hyperbole.

http://www.vox.com/2015/1/29/7929791/measles-outbreak-2014

tl;dr Measles was imported to a group of unvaccinated Amish by a resident returning from a missionary trip. The Amish accounted for a large portion of those infected in the US. The good news is that many Amish opted to take the vaccine after seeing the effect of measles in their community.

Here is an older article (2024)

http://www.nytimes.com/2014/05/30/health/measles-cases-in-us...

A few snippets from the article.

  * There were fewer than 200 cases last year (2013); the record low was 37 cases in 2004.
  * Eighty-five percent of this year’s cases were in people not vaccinated because of religious, philosophical or personal objections, Dr. Schuchat said.
  * Almost half the cases were part of a continuing outbreak in Amish communities in Ohio 
  * In an unusual twist, over half were ages 20 or older. They may have included adults whose parents refused to vaccinate them years ago, she said.
  * Forty-three of the 288 who contracted the virus were hospitalized, most with pneumonia. None died.
  * There were 60 cases in California, mostly in the San Francisco Bay Area and in Orange County, where large numbers of wealthy parents refuse to vaccinate their children.

And to put it in perspective

* France, the world’s most popular tourist destination, had an outbreak of 20,000 cases from 2008 to 2011.

The 2014 CDC MMWR report if you want

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6322a4.htm?s_cid=...