The United States has reported 4,410 confirmed measles cases as of October 15, 2026, according to the Centers for Disease Control and Prevention (CDC), with cases recorded across 47 jurisdictions and among international visitors.
Of the total, 4,392 cases were reported by US jurisdictions, while 18 involved international visitors. The CDC reported 42 new measles outbreaks in 2026, with 96% of confirmed cases linked to outbreaks. This includes 2,844 cases associated with outbreaks that began in 2026 and 1,384 linked to outbreaks that started in 2025.
The figures exceed the 2,289 confirmed cases reported for the whole of 2025, when 48 outbreaks were recorded and 90% of cases were outbreak-associated. In 2024, the US reported 285 confirmed cases across 16 outbreaks, with 69% linked to outbreaks.
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The CDC’s data include confirmed cases reported by jurisdictions and may not include probable cases that have not been confirmed.
Measles is a highly contagious viral disease that can cause serious complications, particularly in young children and people who are not vaccinated. Public health authorities encourage vaccination and advise communities experiencing outbreaks to follow official guidance on prevention, symptoms and seeking medical care.
The CDC continues to update its surveillance data as jurisdictions report new confirmed cases and outbreaks.
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