State health officials are seeking to confirm the vaccine status of the four self-reported cases, but no mutations of the virus have been recorded.

A measles outbreak continues in Texas, with 58 cases now reported. Most of the cases are in children and people who are not vaccinated.

A fast-growing measles outbreak has infected dozens in Texas and New Mexico as officials suspect the highly contagious disease continues to spread. In just two weeks, an outbreak in West Texas jumped from two cases among unvaccinated children in Gaines County to 49 people across four counties,