A child in West Texas has died of measles, state health officials said on Wednesday, the first reported U.S. death from the highly contagious disease in a decade, as a Texas outbreak has grown from a handful of cases to more than 130 across two states.

The first confirmed case of measles in North Texas since the outbreak began has been reported, officials with Rockwall County announced.The Texas Department of State Health Services reported an adult resident with measles on Feb.

At least 124 cases have been reported since late January, mostly among children and teenagers who were unvaccinated or whose vaccination status was unknown.