Response plan
loading respiratory-virus surveillance…
Unofficial · descriptive surveillance, not a forecast. CDC surveillance indicators (% of visits, hospitalization rates, wastewater levels) — not case counts. The most recent 1–2 weeks are preliminary and revise. Not for individual, clinical, or policy decisions. If you are sick and worried about your health, contact a clinician or your local health service; for an emergency call 911.

U.S. Respiratory Virus SurveillanceWhat's circulating now — influenza, COVID-19 and RSV across outpatient visits, hospitalizations, and wastewater

— — measured CDC surveillance interpretive seasonal framing
● Current respiratory season at a glance measured
Share of emergency-dept visits · week ending —
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Seasonal intensity vs. this dataset's own range
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— · % of ED visits, weekly (NSSP, Oct 2023→now). Shaded = the latest preliminary weeks.
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▦ Hospitalization-rate trends — flu · COVID-19 · RSV measured
Weekly new-admission rate per 100,000 population (RESP-NET surveillance: FluSurv-NET, COVID-NET, RSV-NET). Current rate, recent direction, and a season sparkline. Direction is the signal; absolute scales differ by virus.
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≈ Wastewater viral activity derived
A leading "what's in the community" signal: CDC's National Wastewater Surveillance System (NWSS) wastewater viral-activity level (WVAL). Here we summarize each week as the unweighted derived mean of ordinal site categories across all reporting sites, on a 1 (Very Low) → 5 (Very High) scale. This interpretive score is not an official national WVAL or a population-weighted concentration.
Unweighted mean of site activity categories, weekly (Sep 2024→now). 1 = Very Low … 5 = Very High.
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▤ State wastewater activity — latest week derived
States ranked by mean wastewater viral-activity level (1 Very Low → 5 Very High) for the selected virus, latest reporting week. Small territories with few sites can swing high or low on thin data.
Each state's value is the mean activity category across its reporting wastewater sites for the latest week — a coarse summary, not a population-weighted prevalence. Coverage varies by state; a few jurisdictions report few sites. Off-season, most states sit at Very Low.
◍ What these indicators mean — and don't interpretive