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.

The measles outbreak that began in West Texas is still growing, with exposures on university campuses and other places in San Antonio and San Marcos.

A child infected during Texas' measles outbreak has died, marking the first fatality since the highly infectious disease began spreading roughly a month ago, state health officials said. The school-aged child wasn't vaccinated,