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New coronavirus variants could cause more reinfections, require updated vaccines
Kai KupferschmidtScience’s COVID-19 reporting is supported by the Pulitzer Center and the Heising-Simons Foundation.When the number of COVID-19 cases began to rise again in Manaus, Brazil, in December 2020, Nuno Faria was stunned. The epidemiologist at the University of Oxford had just co-authored a paper in Science estimating that three-quarters of the city’s inhabitants had already been infected with SARS-CoV-2, the pandemic coronavirus—more than enough, it seemed, for herd immunity to develop.