Here is an explanation on how influenza occurs every year with its variants.
Notice how the seasonal flu has disappeared from the general population?
That is because they are purposely labelling everything as covid-19.
Fear mongering in order to have people take the experimental / non FDA approved vaccine.
https://www.cdc.gov/flu/about/viruses/types.htm
"Of all the influenza viruses that routinely circulate and cause illness in people, influenza A(H3N2) viruses tend to change more rapidly, both genetically and antigenically. Influenza A(H3N2) viruses have formed many separate, genetically different clades in recent years that continue to co-circulate."
"Seasonal flu vaccines do not protect against influenza C or D viruses. In addition, flu vaccines will NOT protect against infection and illness caused by other viruses that also can cause influenza-like symptoms. There are many other viruses besides influenza that can result in influenza-like illness (ILI) that spread during flu season."