Seattle

Epidemiological Brief

Seattle scores 40.4 (MEDIUM risk) as of 2026-08-07. Pertussis (whooping cough) is the dominant signal, scoring 55/100 — the highest pertussis contribution among all 16 host cities — reflecting a substantial ongoing outbreak in Washington State with an incidence of 9.96 cases per 100,000. Measles is the second-highest component at 50.7/100, indicating active case detection in the Pacific Northwest. Influenza-like illness contributes 22.8/100 with an ILI rate of 6.3%, above summer norms. Mpox contributes 20/100 at sentinel-level. COVID-19 and dengue signals are low. Wastewater surveillance (ATCP-73RE) monitors COVID-19 and influenza with no alert triggered. Data coverage is medium (82%), providing moderate confidence. Conditions are mild and dry (21°C, 63% relative humidity, no precipitation). International arrivals total 16,380. The co-circulation of pertussis and measles presents the most pressing vaccination-related concern in Seattle; attending medical staff should verify vaccination records and report any suspected cases promptly to local public health authorities. Routine respiratory hygiene measures apply for COVID-19 and influenza.

Model SCEME v3.1 · Updated August 7, 2026

Please consult a local doctor or pharmacist for guidance and medication.