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Measles Update: October 9, 2026
The latest CDC numbers show a 5.0% increase of measles cases from week-to-week. The US total reached 4,080 confirmed cases, 78% above all of 2025.
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With US measles cases nearing 3,900 this year and Pennsylvania reporting its fifth measles-related death, here is a review of how the virus spreads, how it is prevented and managed, and what severe disease looks like.
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The latest CDC numbers show a 6.2% increase of measles cases from week-to-week. Last week there was a 5.4% increase in cases showing a continuing steady increase dictated by ongoing outbreaks across the US.