COVID-19 Event Risk
Real-time, interactive map estimating the chance that someone with COVID-19 is present at a gathering, for every US county.
Built during the pandemic with the Weitz and Andris groups at Georgia Tech, the tool combined daily county case reports with serology-derived ascertainment bias to estimate real-time infection rates — serving 50 million risk predictions to 8 million people and informing public guidance on gathering sizes.