Covid-19 pandemic killed off one strain of the flu, and that will change the next vaccines

The Covid-19 pandemic killed off one strain of the flu, and that will change the next vaccines | CNN For 10 years, Americans have had access to flu shots that protect against four strains of the virus: two A strains and two B strains. Brenda Goodman CNN

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In 2020, all the precautions that helped people avoid Covid had an unexpected benefit: An entire branch of the flu’s family tree, a B strain that geneticists call the Yamagata clade, disappeared, and it hasn’t been detected since.

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