health_surveillance

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US public-health surveillance signals from the CDC — the current level + week-over-week direction of circulating illness, not individual case data. `topic` = "respiratory" (default — emergency-department visit shares + clinical-lab test positivity for COVID-19 / influenza / RSV) | "wastewater" (CDC NWSS viral-activity levels in community wastewater, an early-warning leading indicator). Each metric carries its reporting week + trend. COVERAGE: United States ONLY (CDC networks); surveillance is a population-level signal with reporting lag, not a real-time case count or a diagnosis. Source: CDC (cdc.gov) NSSP + NWSS open datasets — US Government public domain (17 U.S.C. § 105), keyless; carries CDC attribution + the standard non-endorsement note. Informational only, not medical advice. Every value is returned in an Ed25519-signed, provenance-stamped envelope (source and observation time) you can verify offline against /.well-known/keys, no account required.