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While the majority of patients were found in neighborhoods close to the hospital, there were several cases scattered throughout the metropolitan area, said Dr. David Ho, a co-leader of the study.

“The magnitude of it is just horrifying,” said Jeffrey Shaman, a professor of environmental health sciences at Columbia University who has modeled the virus’s spread.

“It’s a great moment of optimism, but it’s also very fragile in a lot of ways,” said Wafaa El-Sadr, an epidemiologist at Columbia University’s Mailman School of Public Health.