A child has died of measles in Texas, officials said — the first death from the highly contagious disease the United States has seen in a decade. The school-age child was not vaccinated, according to the Texas Department of State Health Services.

State and local health officials are urging individuals to receive MMR vaccine as Texas reaches 124 cases this week. Here is what we know.

Measles is a highly contagious disease. Here's what you should know about how to protect yourself against measles, as well as what's happening in Texas and New Mexico.