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

A measles outbreak in West Texas has topped 120 cases and resulted in the first U.S. death from the illness in a decade.