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Key Points

The measles outbreak continues to grow in the U.S.

Some groups are more vulnerable than others, according to doctors.

The vaccine can quickly offer protection if you’re unvaccinated.

The measles situation in the U.S. continues to get worse, with 3,294 confirmed cases across 47 states and jurisdictions in 2026 alone, per data from the Centers for Disease Control and Prevention (CDC) that was updated on September 11. The vast majority of them have been associated with outbreaks—there have been 38 new ones reported this year, with Pennsylvania emerging as a hotbed for the highly contagious disease.

Health officials in the state…

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