# South Carolina’s measles outbreak jumped to Washington state 5 times in 2 weeks

- URL: https://talkfuse.com/story/south-carolinas-measles-outbreak-jumped-to-washington-state-5-times-in-2-weeks/
- Published: 2026-10-27T22:22:32+00:00
- Updated: 2026-10-27T23:03:47+00:00
- Original publisher: Ars Technica
- Original article: https://arstechnica.com/health/2026/10/domestic-travel-poses-growing-risk-for-measles-and-a-new-challenge-for-states/
- Topics: Culture, Travel

## Key points

- South Carolina’s outbreak reached Washington through five separate introductions.
- The Washington cases totalled 26.
- Sequencing helped distinguish imported cases from local spread.

## Summary

Five separate measles introductions from South Carolina brought the virus to Washington state over two weeks in January, resulting in 26 cases. The findings show how domestic travel can spread measles between states as vaccination rates fall and outbreaks become more frequent.

Washington officials used contact tracing and whole genome sequencing to distinguish five introductions from a single chain of local transmission. One cluster grew to 14 cases after infectious visitors and their contacts went to schools, healthcare facilities and a church; another reached seven cases. Isolation, quarantine and contact tracing helped stop further spread.

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