The #Covid19 pandemic killed off one strain of the flu, and that will change the next vaccines

"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."

https://edition.cnn.com/2024/03/05/health/flu-vaccine-yamagata-strains/