Since flu is also a air-borne respiratory virus, masks would have no effect on it, either. So, that can’t be “IT”.
But, you may have nailed it with the “flu vaccine might have done the job”, sorta. Please forgive any misquote.
Historically, flu vaccines are ~50% effective. Not that they don’t defeat the virus. If the vaccine matches the public virus variant then there is a preventative effect.
Rather, it is that flu vaccines at best can target only 6 variants/season. Every season there are numerous variants running about across the world. But, the producers have to pick 6. If they pick the wrong ones, we get a bad season. It’s a crap shoot.
What is more believable is that all flu cases are being systmatically misdiagnosed as Wuhan — by orders of the CDC. By CDC guidelines, you are diagnosed (without testing) as having Covid if you present flu-like symptoms.
I do not believe the doc claiming that he’s testing for flu and not seeing it. Too many “doctors” have sold out or taken the knee to beleive this without widespread corroboration.
Vaccine possibly...and tons of people who normally commute not commuting and working from home. It can’t spread through the office if no one is there.
The flu already doesn’t spread like COVID19 because of more natural immunity from the flu being around a long time with people being regular exposed to it, and from vaccines even with zero mitigation policies in effect.
With those in effect (more telecommuting - can’t spread through the office if no one is there, less international travel, more disinfecting, more people using drive-thrus, take out, and delivery services, etc.), in addition to the above factors, it may have had a greater impact.