Of those infected across the U.S., 97% of cases came from those who are unvaccinated or whose vaccination status is unknown.

The measles outbreak that began in West Texas now totals 725 cases across three states. Less than 10 cases in Texas are considered actively infectious.

The Centers for Disease Control and Prevention confirmed nearly 900 measles cases in the U.S. on Friday, though much of the measles cases in the country remain centered in Texas, which confirmed earlier this week there have been 624 cases of the highly contagious illness in the state this year.