San Francisco

Epidemiological Brief

San Francisco scores 17.67 (LOW risk) as of 2026-08-07. Influenza-like illness is the dominant contributor at 36.4/100 with an ILI rate of 10.1% — the same California-wide rate shared with Los Angeles — reflecting elevated statewide influenza activity above seasonal norms. Mpox contributes 20/100 at sentinel-level, consistent with ongoing low-level community transmission in the Bay Area. Pertussis contributes 17.7/100, reflecting California's background whooping cough activity. COVID-19 contributes 1.6/100. Dengue has been assigned a zero adjusted weight for San Francisco (no local transmission pathway identified), so its contribution is excluded. Measles is minimal at 1.4/100. Wastewater surveillance (ATCP-73RE) monitors COVID-19 and influenza with a composite factor of 1.009; no alert has been triggered. Data coverage is medium (81%), providing moderate confidence. Conditions are cool and humid (17°C, 83% relative humidity, no precipitation) — atypical summer conditions that may sustain respiratory pathogen transmission. International arrivals total 15,990. Standard respiratory hygiene for influenza and COVID-19 is the primary recommendation; mpox awareness messaging and pertussis vaccination verification are additionally advised.

Model SCEME v3.1 · Updated August 7, 2026

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