Seattle

Epidemiological Brief

Seattle presents a MEDIUM epidemic risk (41.7), with influenza and pertussis as the primary active components. Influenza ILI% of 13.5% contributes a significant weighted score, while pertussis incidence of 10.0 per 100,000 is the highest in-scope value recorded across all US host cities, indicating a local whooping cough surge. Measles activity (0.4 per 100,000) is notable for Washington State; dengue and mpox signals are low-level. The coverage tier is Medium with complete six-component surveillance. Lumen Field event medical teams should be prepared for respiratory illness presentations spanning influenza, pertussis, and COVID-19. Pertussis spreads efficiently in dense crowds; vaccine verification (Tdap) for unvaccinated adults and children is recommended. Washington State DOH should ensure rapid laboratory confirmation capacity for pertussis suspects and coordinate communication to pediatric and neonatal care units, which bear the greatest risk from pertussis importation. Influenza antiviral distribution and point-of-care testing availability at venue health posts are also advised.

Model v2.1.0 · Updated June 11, 2026