Measles outbreaks across Europe and Central Asia intensified in the first quarter of 2024, with incidence rates of up to hundreds of times higher than the United States.

One of the worst-affected areas this year has been Chicago, where 61 cases have been recorded so far, with 54 percent of these cases in those aged under four years, according to the Chicago Department of Public Health.

Levels in Europe and Central Asia have become critical while cases in the U.S. have soared past 100, according to data gathered by the Centers for Disease Control and Prevention. Nationwide, measles cases already are nearly twice the total for all of last year.