The upside of COVID, maybe.
The SARS-CoV-2 pandemic has seen a notable global reduction in influenza cases of both influenza A and B viruses. In particular, the B/Yamagata lineage has not been isolated from April 2020 to August 2021, suggesting that this influenza lineage may have become extinct, which may provide opportunities for improving availability and effectiveness of influenza vaccines.
**Behavioural changes (social distancing, mask wearing and hygiene measures) and travel and movement restrictions are thought to be the major factors driving the reduction in influenza incidence,** [my bold] which was also observed for other common respiratory infections such as respiratory syncytial virus3.