At least 58 cases of measles have been reported in West Texas within the last three weeks — marking the largest outbreak in the state in close to 30 years. The dozens of reported cases have mostly affected 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.

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