Overview
- Ohio health officials declared an outbreak after three unvaccinated children in a single Cuyahoga County household tested positive, with illness onsets spanning late 2025 into early 2026 and links to holiday travel.
- South Carolina reported a sharp rise to 310 cases centered around Spartanburg County, with 200 people in quarantine and most infections in unvaccinated individuals, according to state epidemiologist Dr. Linda Bell.
- San Mateo County confirmed an unvaccinated adult with measles after international travel, which appears to be California’s first case of 2026, with contact tracing underway and no secondary illnesses reported so far.
- An unvaccinated 11‑month‑old in Israel died following severe complications requiring ECMO, as health authorities reiterated early dosing in outbreak areas and advised unvaccinated people to avoid crowded events.
- Public exposure alerts expanded with detailed site lists in western Washington linked to a family visiting from South Carolina and with notices in Kentucky, as agencies advised potentially exposed people to verify immunity and monitor for symptoms.