At least 124 people were known to be infected in West Texas since early February, Texas health officials announced, most of them children. An additional 9 cases were announced on Tuesday, in eastern New Mexico, near the Texas state line where the outbreak has spread to about 10 counties, Texas health officials said.

Texas faces its worst measles outbreak in over 30 years, with the first US measles death since 2015, prompting calls for action from Democratic leaders.

A Texas measles outbreak has doubled in the last week to 124 cases, state health officials said Tuesday, a day after they warned a person infected with the highly contagious disease had traveled from the outbreak zone.