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 hospitalized with measles in West Texas has died. It's the first death in an outbreak that began last month.

An unvaccinated child in west Texas died from measles this week, according to a Wednesday news release from the Texas Department of State Health Services. This is the first death from the west Texas measles outbreak that began late last month, and is the first death from measles in the United States since 2015.