Excellent and informative comment, thanks.

Flu vaccines have been so drilled into people's minds that many folks, particularly elderly ones, get them almost religiously. They also believe the mantra that, 'even if I get it, it will be less severe thanks to the vaccine'.

Also, few realize that most people who fall sick during annual 'flu epidemics' are not actually tested for flu. When they are tested, it often turns out that they don't actually have influenza, but what are categorized as 'influenza-like' illnesses.