A second child in Texas has died of measles, according to the Texas Department of State Health Services, in a growing outbreak that has infected hundreds of people, the vast majority in unvaccinated communities in Texas.

A second school-aged child has died in Texas from a measles-related illness, a hospital spokesperson confirmed Sunday. The child's death comes as an outbreak of measles originating in West Texas continues to spread.

A second child has died in Texas after contracting measles, The New York Times first reported Sunday—the second confirmed death from the disease in a decade—as more than 600 measles cases have now been confirmed in 20 states, with much of the outbreak centered in northwest Texas.