Flu And Covid Twin-Demic

There are not many silver linings during the Coronavirus pandemic but one is that the feared twin-demic of Covid and flu attacking us humans this winter is failing to materialise, with flu infections plummeting.
The WHO are putting it down to to the lashings of hand sanitiser being used, social distancing and masks but whatever the reason, countries in the Southern Hemisphere who are emerging from their winter saw a record low in flu rates, Australia essentially skipped their flu season this year and early indicators suggest it will follow suit with those of us north of the equator.
Explanations put forward include flu deaths being wrongly classified as Covid or that Covid has crowded out the flu as it is virtually impossible to be sick with two viruses at once.
The third possibility is that more people, are getting the flu vaccination so there is far more immunity but whatever the reason, it's a very thin sliver of good Coronavirus news for a change.