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Jeffrey Shaman, a public health expert at Columbia University, calculated that more than 90 percent of Covid-19 deaths could have been avoided through early May.

Editor's Note: Robert Klitzman is a professor of psychiatry and the director of the bioethics masters program at Columbia University.

On the whole, the theory “has some merits,” said Angela Rasmussen, a virologist at Columbia University who was not involved in the commentary. “But I’m still pretty skeptical.”

“Everything is topsy-turvy right now,” said Michael N. Shadlen, a professor of neuroscience at Columbia University.