Ongoing measles transmission in the United States, driven by multiple active outbreaks and low vaccination coverage in affected communities, continues to push case counts higher according to Centers for Disease Control and Prevention surveillance. As of early May 2026, CDC data show 1,842 confirmed cases nationwide this year, the vast majority linked to outbreaks and occurring among unvaccinated individuals. Recent weekly additions of 20–50 cases reflect persistent community spread across more than 30 jurisdictions, with summer travel likely to introduce additional importations. Traders should monitor the CDC’s next weekly update for any acceleration or containment signals before the May 31 cutoff, as case definitions and reporting lags can influence final tallies used for market resolution.