How theyll know if the COVID-19 vaccines work is a matter of math, biology and a little luck – The Philadelphia Inquirer

And this surveillance must continue even after approval, said Penns Ellenberg. If one of the vaccines provokes an unforeseen reaction in, say, 1 out of 10,000 recipients, on average, then it very possibly might not show up in an initial trial group of 15,000 or 20,000 people, she said.

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How theyll know if the COVID-19 vaccines work is a matter of math, biology and a little luck - The Philadelphia Inquirer

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