(NEW YORK) — The number of measles cases in the U.S. has risen to 884, according to new Centers for Disease Control and Prevention data published Friday.

Cases have been confirmed in 29 states including Alaska, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Montana, New Jersey, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Texas, Vermont, Virginia and Washington.

At least six states including Indiana, Kansas, Michigan, New Mexico, Ohio and Texas are reporting outbreaks, meaning three or more related cases.

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In Texas, where an outbreak has been spreading in the western part of the state, at least 624 cases have been confirmed as of Tuesday, according to the Texas Department of State Health Services.

Dr. Marschall Runge, dean of the University of Michigan Medical School and CEO of Michigan Medicine, said the number of cases — at the national level and in Texas — is likely an undercount.

“I think it’s likely that there are a lot of unreported cases in children who weren’t particularly sick or didn’t come to medical attention,” he told ABC News.

This is a developing story. Please check back for updates.

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