A recent study indicates that a measles outbreak originating in South Carolina spread to Washington state through five separate importation events in January, leading to 26 cases. The South Carolina outbreak, which began on October 2, 2025, and ended on April 26, 2026, resulted in 997 confirmed cases, marking it as the largest outbreak since measles was declared eliminated in the US until it was surpassed by another outbreak in Pennsylvania.
Key facts
- Measles was declared eliminated in the US in 2000.
- The South Carolina outbreak began on October 2, 2025.
- 997 cases were confirmed in South Carolina during the outbreak.
- The outbreak was declared over on April 26, 2026.
- Washington state reported 26 cases linked to the South Carolina outbreak.
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