San Francisco Bay Area

Epidemiological Brief

San Francisco Bay Area shares California's state-level surveillance data and presents an identical epidemiological profile to Los Angeles this week. Influenza A(H3N2) is the primary signal: 13,763 state weekly cases against a 52-week peak of 15,854 (normalized 86.8/100), reflecting persistent late-season H3N2 circulation statewide. Mpox (clade II) contributed 1 new California case in EW17 (53 YTD, normalized 33.3/100); the Bay Area historically accounts for a notable share of California's mpox burden and ongoing community transmission cannot be excluded. Measles: 0 new California cases in EW18 (22 YTD). No hantavirus detections. The composite Santé score is 33.4 (low). Given the Bay Area's dense transit-linked population and high international visitor flows during the tournament, the near-peak influenza signal warrants active respiratory surveillance at all venue entry points. Mpox vaccination coverage among eligible attendees should be confirmed through local health authority communications. All venue healthcare teams should stock antivirals and be briefed on mpox clinical recognition. Sante Index v0 is a watching signal, not a forecast.

Model v0 · Updated Jun 8, 2026