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The New York City Department of Health says this is no cause for alarm, but doctors should be on the lookout for symptoms.

So far this year there have been 13 cases of measles, when usually there would only be around five.

Health officials attribute the jump to fewer people vaccinating against measles, as well as overseas travel, particularly to Europe.

Medical officials are urging New Yorkers to make sure they are fully vaccinated, especially before they travel.

"Many people said, 'Oh, I got my shots when I was a child,' and they don't realize that they may not have and they might not actually be immune. In fact, seven of our cases fall into that category. People thought they had been vaccinated," said Dr. Jane Zucker of the Department of Health.

Five of the 13 cases seem to have been contracted in New York City, which has health officials especially concerned that some families are not following vaccination schedules.

The measles vaccine is part of the combined measles, mumps and rubella shots which come in two doses. The first dose should be given just after a child's first birthday and the second dose should come between the ages of four and six.

This spike is also coming at a time when state legislators have passed a bill to end the requirement for city high school students to show proof they have been fully vaccinated before starting college.

Local health officials are concerned that measure may get in the way of their ability to respond to potential outbreaks and are encouraging Governor Andrew Cuomo to veto that bill.

A similar increase in measles cases has been reported nationwide.