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.

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

Measles cases has risen to 124 across several counties in West Texas, and health officials are seeing no clear end in sight to the outbreak. Texas Department of State Health Services confirmed the first death related to the outbreak Wednesday.