There is nothing to be said about the flu front that hasn't been panicked about in the news. People just have to remember that the Flu does kill people... a good number in every state... so it is nothing to ignore. Don't believe me... check it out on the web.
The flu vaccine does not protect against an individual strain, but a group of related strains (and given some years, a combination of several groups of related strains). So it will give you protection (full or partial) from any bug in the same family. It does not stop every bug . If a new one comes from somewhere else (visitor, line jumper, or just a minor non-included strain that breaks from the pack and surges ahead) hope you have immunity from its ancestor's previous visits. (Hence the reason why cross species jumps are so scary)
Also remember that the vaccine helps build herd immunity. Bugs do not pass around much if they do not have ready hosts. Enough people immuoized keeps the numbers down. The better the herd immunity, the smaller chance of transmission and mutation.
After all... are your measles shots up to date? How many people whent "on the cheap" and didn't immunize their kids. They saved themselves the 30 bucks for the shot. Then their kid gets measles or worse yet acted as a carrier. Measles kill 400 people a day around the world... in populations that don't have immunizations. Sure, you are unlikely to die in the first world... but notice I said Unlikely.
Flu... pretty much the same way.
The average person will get the flu once every 4 years (though the number 7 is often thrown around). The darn things cycle fast enough. Your immune system should handle it if you stop, rest, eat well, and drink fluids. If you don't... then be prepared for weeks of torture and possibly an involuntary visit to the MD via ambulance.
Just a note: Silveressa's high acid (vit c) defense works in small/ low contact areas. If you are in a high traffic/ high population areas, even adding zinc, it will not protect/ immuproof you from the ever shifting germ sea.
That is all I know for now... AT least this year does not have a plague possible flu like two or three years back.