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.

Measles is spreading across the U.S., with an outbreak growing in Texas and cases reported in nearby states. Experts explain whether or not you should be concerned.

As measles cases in Texas and New Mexico continue to increase, health officials are urging caution and vaccination. Here is what to know.