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WashU Expert: Without requiring vaccines, filled stadiums are unsafe

Some 135,000 fans gathered in the Indianapolis Motor Speedway for the Indy 500 over the 2021 Memorial Day Weekend. A Washington University in St. Louis mathematician, who helped write a scientific formula and a paper regarding the risk analysis of fans attending sporting events, has a simple, evidence-driven answer to two questions about that race crowd: How many were vaccinated? How many were safe from COVID-19 transmission?