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.

An unvaccinated child has died as the Texas measles outbreak reaches 124 cases. Public health officials also warn of potential spread in San Marcos and San Antonio.

A child died from the measles after being hospitalized in Lubbock, the first death amid an outbreak that began last month in the South Plains region, health officials said. The Texas Department of State Health Services confirmed the school-aged child's death on Wednesday but did not offer any additional details about the child's age or identity.