San Francisco

Epidemiological Brief

San Francisco holds a LOW epidemic risk score (21.4), with the profile dominated by influenza and a negligible dengue adjusted contribution. Influenza ILI% of 16.8% (shared with Los Angeles as same California statewide data) remains the primary active signal. Mpox (0.1 per 100,000) and pertussis (1.1 per 100,000) contribute minor components. Measles activity is very low (0.01 per 100,000). Dengue is logged at an adjusted score of zero, reflecting no meaningful local transmission in San Francisco's cooler microclimate despite the state-level data. Levi's Stadium medical teams should focus preparedness resources on influenza triage and antiviral protocols. Santa Clara County Public Health should monitor for respiratory illness clusters in the weeks preceding and during matches. Visitors are advised to be current on influenza and COVID-19 vaccinations. The relatively low measles signal does not eliminate importation risk given the internationally diverse crowd profile; MMR verification remains advisable for all attendees under 60 without documented two-dose vaccination.

Model v2.1.0 · Updated June 11, 2026