At my age & having lived in Western Cdn all these yrs incluiding a lot of outdoor winter sports--------believe me I have seen a lot of flus come & go.
To those that do not have it yet (tap wood in my case) get the flu shot even if it is not PERFECT. Thoroughly wash your hands properly & often, do NOT become chilled at home, outdoors or at work. Do not try to be the mocho man in walking around bare headed when it is cold to snowing, close up the neck of a jacket when outside, make sure the cold is not going at the ankles or up the legs, or wrists & hands.
Do not weaken your system by parting untill the wee hrs & do not become stressed at work or home. You have a hot tub ----- then stay clear of it for a while. Someone around you coughing, blowing nose continually or hacking then try to get clear of them.
You drive a cage in this time of yr then toss in extra clothing to keep you warm under normal conditons ---- more so then what you started out on. In my truck is a long & much warmer coat I used when surveying, along with extra socks of thicker wool in a pair of winter boots, to even an oversized pair or warm pants to fit over what I presently wear, another heavy oversized sweat shirt, numerous toques & hats to at least three pair of gloves & latter are a pair of snowmovile ones & a few thick wook towels that can be used like winter mufflers. Crumbs there is even a good sleeping bag, survival blanket & an ex-army wool blanket. Simply so many yrs of living in the Mtns (as I still do) & knowing what it is like to find myself cought in a snow storm & no way out or place to stay. So I can bundle up in the cab or dress up properly & hike it some 2 to 6 miles to a place were I can obtain help, meals, sleep, etc.
May sound a bit extreme, BUT I have been forced to use the above more then once when travelling from one spot to another.