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,

Texas reported 90 cases this week, while New Mexico reported nine. A majority of the cases have been in a Texas county where vaccination rates have lagged behind the rest of the state.

An unvaccinated child has died as measles cases in rural West Texas continue to surge, making it the largest outbreak in the US in six years. Initially confined to a close-knit Mennonite community, the outbreak has now spread to other under-vaccinated groups.