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Measles outbreaks surge to top 3,500 cases this year: These tracker maps show the areas hardest hit

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Measles outbreaks surge to top 3,500 cases this year: These tracker maps show the areas hardest hit

According to data from the International Vaccine Access Center at the Johns Hopkins Bloomberg School of Public Health, measles cases have now surpassed the 3,500 mark—a level not seen in 35 years.

Here’s what you need to know about the multiple outbreaks affecting the country, and which areas are currently being hit the hardest.

According to the Johns Hopkins Bloomberg School of Public Health, as of September 18, 3,568 measles cases were reported in the United States this year so far.

More worryingly, nearly 10% of those cases—341 of them—occurred in the previous two weeks leading up to September 18.

The figure is nearly 1,300 more than the total U.S. measles cases reported in all of 2025, and a level not seen since 1991, when the U.S. Centers for Disease Control and Prevention (CDC) says measles cases reached 9,643.

Speaking of those CDC numbers, if you look at the agency’s official data up to September 18, you’ll see it differs slightly from the John Hopkins’s data. According to the CDC, measles cases for 2026 in the U.S. stand at 3,471 as of September 18. That’s a discrepancy of 97.

The difference seems to stem from the timeframes and the data the CDC uses to update its official measles dashboard, including, as the Guardian noted, how it registers measles deaths.

The CDC says its dashboard is updated with “only confirmed measles cases notified to CDC as of noon on Thursdays,” while John Hopkins updates its dashboard on Fridays “with intermittent updates as warranted.”


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