At least 124 cases of measles have been reported in Texas since late January — marking the largest outbreak in the state in close to 30 years. The dozens of reported cases have mostly affected children,

Health authorities warned of further spread. Most U.S. measles cases this year involved people 19 and under and those without a confirmed vaccination.

The measles outbreak in 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.