The outbreak — which includes 124 people — has led to the country's first measles death since 2015, as vaccination rates continue to decline in the U.S.

Texas officials on Wednesday announced the first measles death in the state's ongoing outbreak of the highly contagious disease. The death, of a school-age child, is the first measles death in the U.S. since 2015, according to the Centers for Disease Control and Prevention.

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,