About COVIDcast

In March 2020, Delphi pivoted from seasonal epidemic forecasting to COVID-19 tracking. Since then, we’ve created and maintained the nation’s largest public repository of diverse, geographically-detailed, real-time indicators of COVID-19 activity in the U.S. Our indicators cover every rung of the severity pyramid, and are freely available through our public API or our data export tool.

Several of the underlying data sources (on which these indicators are built) would not exist or be publicly available without our efforts. This includes:

We have selected a small number of indicators to showcase in COVIDcast, a visualization system that helps place pandemic activity in geographic and temporal context. It includes a notion of correlation across time, for example, a spike in cases is often followed by a spike in hospital admissions some number of days later.