Enlarge / A bottle of influenza vaccine at a CVS pharmacy and MinuteClinic on September 10, 2021, in Miami. Getty | Joe Raedle
The pandemic coronavirus’ debut wrought universal havoc—not even seasonal flu viruses were spared. Amid travel restrictions, quarantines, closures, physical distancing, masking, enhanced hand washing, and disinfection, the 2020-2021 flu season was all but canceled. That meant not just an unprecedented global decrease in the number of people sick with the flu but also a dramatic collapse in the genetic diversity of circulating flu strains. Many subtypes of the virus all but vanished. But most notably, one entire
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