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.

A child who was hospitalized with measles has died from the illness in West Texas, state and local health officials announced Wednesday. It is the first death in a measles outbreak that has infected more than 120 people since late last month.

Officials say the school-aged child was not vaccinated and was hospitalized in Lubbock last week after testing positive for measles. This is the first death in the U.S. caused by measles since 2015, according to the CDC.