Measles cases in the United States have reached their highest number in more than 30 years, according to new federal data published Wednesday.

Confirmed measles cases in the U.S. reached a total of 1,288, according to data from the Centers for Disease Control and Prevention on Wednesday, rising above 2019 levels as the country battles one of its worst outbreaks of the childhood disease.

The number of reported measles cases in the United States has hit 1,288 in the first six months of this year, the most since the disease was declared eliminated in 2000.