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A Doomsday COVID Variant Worse Than Delta and Lambda May Be Coming, Scientists Say Photo Illustration by Newsweek Scientists keep underestimating the coronavirus. In the beginning of the pandemic, they said mutated versions of the virus wouldn t be much of a problem until the more-infectious Alpha caused a spike in cases last fall. Then Beta made young people sicker and Gamma reinfected those who d already recovered from COVID-19. Still, by March, as the winter surge in the U.S. receded, some epidemiologists were cautiously optimistic that the rapid vaccine rollout would soon tame the variants and cause the pandemic to wind down.

New yorkUnited statesSouth carolinaJonathan eisenEric vailMichael osterholmPreeti malaniRichard neherCenters for diseaseUniversity of californiaSinai medical centerUniversity of massachusetts medical schoolWorld health organizationInfectious disease researchUniversity of michiganSwitzerland university of basel