I was reading about this on Google today, but I read the opposite. That it was primarily unvaccinated people who were being infected:

Unvaccinated behind largest U.S. measles outbreak in years

The largest U.S. outbreak of measles to occur in 15 years -- affecting 214 children so far -- is likely driven by travelers returning from abroad and by too many unvaccinated U.S. children, according to new research.

The finding could highlight the dangers of a trend among some U.S. parents to skip the measles-mumps-rubella (MMR) vaccine for their children, out of what many experts call misguided fears over its safety.
----------------------------------------------------------

Largest Measles Outbreak in Years Tells Cautionary Tale, Underscores Importance of Vaccination

This year�s jump in measles in the United States and Canada was costly and occurred among unvaccinated children and adults, suggest several studies being presented at the 49th annual meeting of the Infectious Diseases Society of America (IDSA).

Thanks to a successful infant measles, mumps and rubella (MMR) vaccination program, measles has been declared eliminated in the United States � meaning the illness hasn�t had continuous spread � since 2000. But outbreaks can occur when the infection is imported, typically by unvaccinated Americans who are infected while traveling to Europe or other continents and then return home, or by foreign tourists who are infected and travel to this country.

Measles Outbreak

-----------------------------------------------------------

Americas: The last case of endemic measles was reported from the region in 2002. In 2011 the Region has received reports of several outbreaks linked to importation of measles virus from other regions. The largest, in Quebec, Canada, involves 742 reported cases, 89 requiring hospitalization, but no measles-associated deaths. Other outbreaks have been reported from the United States (213 cases), Ecuador (41 cases), Brazil (18 cases), Columbia (7 cases), Mexico (3 cases), and Chile (6 cases). Most of these outbreaks are linked to importations from Europe, except for outbreaks in the United States and Chile linked to cases from Malaysia and the outbreak in Ecuador, linked to Kenya.

Measles is a highly infectious disease that causes complications and deaths, even in previously-healthy individuals, but is fully preventable by vaccination. Countries need to ensure that they reach 95% coverage with two doses of measles vaccine across all age groups up to 15 years of age.

World Health Organization: Measles Alert

Here is a link that might be useful: Unvaccinated behind largest U.S. measles outbreak

tally, I think sheilajoyce is referring to an outbreak of 98 measles cases in a town in Quebec where 54 of the patients HAD been fully vaccinated as children. They feel the outbreak hit Quebec via visitors from France, but they were shocked to discover that more than half the cases were amongst those who had received all their vaccines. Here is the article.
http://www.cbc.ca/news/health/story/2011/10/20/measles-quebec-vaccine-schedule.html