A West Texas person who was hospitalized with measles has died, marking the first death from the illness in an outbreak that began last month in the South Plains region. Texas Tech University Health Sciences Center spokesperson Melissa Whitfield confirmed the death Wednesday,

A measles outbreak in western Texas that began last month keeps growing, from 58 cases last week to 124 cases as of Tuesday.

The outbreak is primarily affecting West Texas, but officials in San Antonio, New Braunfels and San Marcos are monitoring cases after an infected person recently visited the area, according to the Texas Department of State Health Services.