“Scientists have concluded that widespread physical distancing and masking practiced during the early days of COVID-19 appear to have pushed B/Yamagata into oblivion.
“This surprised many who study influenza, as it would be the first documented instance of a virus going extinct due to changes in human behavior, said Dr. Rebecca Wurtz, an infectious disease physician and epidemiologist…”
**The flu shot is different this year, thanks to COVID**: https://www.npr.org/sections/shots-health-news/2024/10/17/nx-s1-5155104/flu-shot-vaccine-b-yamagata-extinct