Globally, measles is on the rise across the U.S., Canada, Mexico, South America^[1] and parts of Europe^[2]. In 2025, North and South America saw 11 times more cases than during the same period last year. In Europe, measles rates are at their highest point in 25 years.

In the U.S., as of May 2, 2025, health authorities have confirmed 935 cases of measles affecting 30 states^[3]. This is a huge surge compared with the 285...