The measles outbreak in the United States continues to grow. As of Friday, the number of cases reached 1,234.

That's according to the Centers for Disease Control and Prevention. That number is 19 cases more than the previous week.

Cases have been confirmed in 31 states. The CDC says most are among people who were not vaccinated against measles. It also reported more than 75% of measles cases were linked to outbreaks in New York state and New York City.

January of this year, in Hawaii there were two cases reported on the Big Island that involved two Washington State children. The two had not been vaccinated. No other reports have been made.