Of the 2,066 counties the study looked at, 78% saw a decline in MMR vaccination rates. But rates can vary substantially within a state.

The Centers for Disease Control and Prevention is warning that people can get infected with measles during travel or at crowded events, unless they are fully vaccinated or have had the disease. “Travelers can catch measles in many travel settings,

Across the U.S., there are 1,024 confirmed measles cases as of Friday. Texas still accounts for the vast majority of cases. There are three other major outbreaks in North America.

Texas health officials reported just one new measles case over the last week, an apparent signal the spread of the highly contagious illness has slowed in the state, after a slight uptick in cases was reported in dozens of other states.