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.

According to the Texas Department of State Health Services (DSHS), the victim was an unvaccinated school-aged child who died on Feb. 26 in a hospital in Lubbock after being diagnosed with measles last week.

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