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.

The measles outbreak in rural West Texas has grown to 90 cases across seven counties, the state health department posted online Friday, and 16 people are hospitalized.