Respiratory threat levelCalifornia
Sample dataModerate
Holding steady
Moderate
2
FluRSVCOVID-19combined
SF Bay Area · California
Moderate
2
Holding steady
What's going around in SF Bay Area: flu, RSV & COVID-19
The respiratory picture for SF Bay Area, from public-domain CDC surveillance — honestly labeled: the combined index is published at California state level, refreshed weekly.
California's respiratory surveillance is published by the state Department of Public Health (cdph.ca.gov), with wastewater viral activity tracked through the CDC's NWSS network across participating Bay Area sewersheds. Several county health departments across the region also publish local respiratory snapshots. The state-level picture below is the combined flu, RSV and COVID-19 read for California — the most complete public picture that covers the whole Bay Area with one consistent method.
Trends, not real-time counts
Surveillance data is reported with an inherent lag of roughly one to two weeks. FluTrack shows directional trends, not a real-time case count. For general information only — not medical advice.
By virus
How each respiratory virus is contributing across California right now — the public data that covers SF Bay Area.
Influenza (Flu)
Minimal
0
Holding steady
COVID-19
Moderate
2
Rising +12%
RSV
Minimal
0
Holding steady
What the data shows
ED visits for respiratory illness
Share of emergency-department visits (NSSP)4.0%
Share of emergency-department visits (NSSP)4.0%
Wastewater viral activity
CDC NWSS viral activity index (leading indicator)5.7
CDC NWSS viral activity index (leading indicator)5.7
Test positivity
Share of lab tests positive (NREVSS)13.0%
Share of lab tests positive (NREVSS)13.0%
SF Bay Area: common questions
What sickness is going around in SF Bay Area right now?
The combined flu, RSV and COVID-19 picture shown at the top of this page comes from California-level CDC surveillance — the most complete public read that covers SF Bay Area with one consistent method. It is a directional weekly trend, not a real-time case count. For metro-specific detail, the official sources listed above go deeper than the combined index.
Is this data specific to SF Bay Area itself?
No — and we label that plainly. The CDC publishes no combined metro-level respiratory index, so the threat level here is the California state reading. Metro-scale public signals that do exist, like wastewater surveillance, are linked in the introduction above.
Where does the data come from?
From the CDC's public-domain surveillance systems — emergency-department visits (NSSP), wastewater viral activity (NWSS) and laboratory test positivity (NREVSS). See our methodology and data sources.
How often is it updated?
Weekly. CDC surveillance systems publish on Fridays, and reported data typically reflects illness from one to two weeks earlier — so FluTrack emphasizes the trend rather than a single day's number.
Is this medical advice?
No. FluTrack is an independent data-visualization utility and is not affiliated with the CDC. The information here is general and is not a substitute for professional medical advice. For guidance about your health, consult a qualified provider.
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