Boy you sure can see a lot of nonsense spouted in a thread like this. Some of you folks really need to spend some time talking to an Immunologist instead of repeating nonsense heard in a Bar.
I failed to get a flu shot a few years back when that nasty H1N1 variant was going around. Thank heavens for Taimiflu because I have NEVER EVER gotten so sick so quickly. The Boyfriend of the receptionist who passed the flu on to me ended up in the U of M Hospital on ECHMO for two solid weeks and at one point his lungs were so full of fluid they couldn't be seen on an X Ray. He also came out of the hospital with partial paralysis in one arm due to needing to be restrained because of extreme delirium and a total bill in excess of $750,000. Yeah, 3/4 of a million bucks to save him from the Flu and to it's credit the U of M forgave all charges. I may be an Ohio State grad but nobody better say something bad about the U of M in my earshot.
Today I make sure that I get the Flu Shot every year without fail and, knock on wood, I have not yet gotten sick with the flu that is going around in spite of this years vaccine being a poor match. BTW, at work right now I'm also washing my hands about once per hour because that is probably the most effective way to keep unexposed.
Let me be really clear, the Flu can be LETHAL, it's not always a couple of days in bed running a fever. Today many Historians believe that WWI ended not because of Armistice, it actually ended because so many people were being killed by the Spanish Flu. BTW, the 1918 Spanish Flu was an H1N1 variant and IIRC it killed something like 18 million people world wide and a large proportion of those killed were between 18 and 30 years of age. For some reason not fully understood H1N1 flu variants are particularly nasty and often lethal. So, don't think that Youth will protect you, get that shot.