A Texas measles outbreak has doubled in the last week to 124 cases, state health officials said Tuesday, a day after they warned a person infected with the highly contagious disease had traveled from the outbreak zone.

A child in Texas has died from measles, officials said Wednesday, the first known death in the current large outbreak in West Texas and the first death from measles in the country since 2015. The individual, described as a school-aged child, was not vaccinated. The gender and previous health status of the child was not disclosed.

A school-aged child in Texas is the first reported individual to die from measles amid an outbreak in the South Plains and Panhandle regions of the state, the Texas Department of State Health Services announced today.