Health authorities warned of further spread. Most U.S. measles cases this year involved people 19 and under and those without a confirmed vaccination.

Nearly 100 cases of measles have been reported across Texas and New Mexico. Measles was declared eliminated from the United States in 2000, making this outbreak a cause for concern. Health officials attribute the rise in cases to plummeting immunisation rates,

Texas reported 90 cases this week, while New Mexico reported nine. A majority of the cases have been in a Texas county where vaccination rates have lagged behind the rest of the state.