LUBBOCK, Texas >> A child who wasn’t vaccinated died in a measles outbreak in rural West Texas, state officials said Wednesday, the first U.S. death from the highly contagious — but preventable — respiratory disease since 2015.

The school-aged child had been hospitalized and died Tuesday night amid the widespread outbreak, Texas’ largest in nearly 30 years. Since it began last month, a rash of 124 cases has erupted across nine counties.

The Texas Department of State Health Services and Lubbock health officials confirmed the death to The Associated Press. The child wasn’t identified but was treated at Covenant Children’s Hospital in Lubbock, though the facility noted the patient didn’t live in Lubbock County.

“This is a big deal,” Dr. Amy Thompson, a pediatrician and chief executive officer of Covenant Health, said Wednesday at a news conference. “We have known that we have measles in our community, and we are now seeing a very serious consequence.”

Robert F. Kennedy Jr., the nation’s top health official and a vaccine critic, said Wednesday that the U.S. Department of the Health and Human Services is watching cases and dismissed the Texas outbreak as “not unusual.”

He appeared to misstate a number of facts, including a claim that most who had been hospitalized were there only for “quarantine.” Dr. Lara Johnson at Covenant contested that characterization.