NSSP (National Syndromic Surveillance Program) covers a large fraction of US ED visits
via the BioSense platform / ESSENCE. This Socrata feed is a state-aggregated weekly
summary of three respiratory pathogens; finer-grained NSSP data (sub-state HSA, broader
case definitions) is gated and not exposed here.
South Dakota does not participate in NSSP and is absent from this feed. State
participation has expanded over time… See the full description on the dataset page:
https://huggingface.co/datasets/EPI-Eval/cdc-nssp.
