Amid the COVID-19 challenges, a significant breakthrough emerged: The eradication of a prevalent strain of influenza. The Yamagata-lineage of type B influenza, once a significant contributor to seasonal flu outbreaks, has been absent from surveillance reports since March 2020. COVID-19 restrictions gave it “the killer blow which knocked it out,” said Ian Barr, deputy director of the World Health Organization’s Collaborating Center for Reference and Research on Influenza in Melbourne, in an...