At least 124 cases of measles have been identified in Texas since late January, mostly among children and teenagers who are either unvaccinated or whose vaccination status is unknown, officials say.

Measles causes a fever, rash and cough, among other symptoms, and can be particularly harmful for babies and young children, according to the Centers for Disease Control and Preve

The first person known to have died from measles in the U.S. in a decade was announced by health officials on Wednesday and described as a "school-aged child" who perished in a children's hospital in West Texas,