At least 58 cases have been confirmed. Health officials — who are scrambling to get a handle on the vaccine-preventable outbreak — suspect 200 to 300 people may be infected.

An outbreak of measles has spread to 48 cases across four counties in the South Plains region of northwestern Texas, doubling in scope from earlier this week, health officials said. Most of the cases are in school-aged children,

The measles outbreak in rural West Texas has grown to 58 cases as of Tuesday. Eight people in neighboring eastern New Mexico also have been diagnosed with the highly contagious disease.