“At that time, experts speculated that precautions taken to stop the spread of COVID-19 — such as masking and social distancing — had not only driven the overall number of flu cases to historic lows but may have completely snuffed out this type of flu virus. “.
Handwashing, masking, distancing, and isolation when sick were simple yet effective behavioral measures taken by the population of the world which actively caused this extinction of the Yamagata lineage. We did it, collectively folks. Congratulations!