“I don’t think there needs to be an individual phone interview with the 53,000 people who attended,” said Dr. Wafaa El-Sadr, an epidemiology professor at Columbia University.

Professor El-Sadr added that all individuals should follow C.D.C. guidelines, which instruct fully vaccinated people who have been exposed to wear a mask for up to 14 days — a period that ends this weekend — and get tested. “I think the pragmatic way to do contact tracing in this context is that everyone should consider themselves a close contact,” she said.

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