The essentials
Measles cases surge as vaccination coverage falls to 92.5% among US kindergarteners.
The United States has recorded 2,318 measles cases by mid-2026, exceeding the entire 2025 total and representing more cases in 18 months than the previous 25 years combined. This resurgence coincides with declining vaccination rates, as measles vaccination coverage among US kindergarteners fell to 92.5% in the 2024-25 school year.
The outbreak's scale has drawn international attention. International health officials are scheduled to assess the US measles elimination status in November 2026, signaling the severity of the situation and its potential implications for the nation's disease control standing.
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18 months of measles cases match 25 years prior
The 2,318 cases recorded by mid-2026 represent an unprecedented spike, with more measles infections occurring in this 18-month period than in the previous 25 years combined. This dramatic acceleration reflects the outbreak's exceptional scope and severity within recent public health history.
Vaccination coverage decline mirrors case surge trajectory
Measles vaccination coverage among kindergarteners declined to 92.5% in 2024-25, falling below immunity thresholds needed for herd protection. This decline preceded and accompanied the case surge, establishing a direct correlation between reduced vaccination rates and outbreak expansion.