Flu shots give an immunization against what is probably 'last year's flu', a virus or combination of viruses that were the danger when the shot was made. But these viruses mutate and the next flu is a different virus. While getting a flu shot may decrease ones chances of getting the flu, there is also the 'cost' of getting a needle poked into your body, containing who knows what. WebMD says 5 to 20% of the population will get the flu. What a huge gap. I'd imagine certain ages and people with certain diseases are more susceptible. (Thanking God here) it has been years and years since I have gotten an actual flu, or developed the full symptoms for it. I'm guessing over 10 years, maybe 15 I might get an occasional mild cough. Is it worth it for me to have a needle stuck in my arm, with last year's bug in it, not even this year's bug? Wouldn't it make more sense for me to just take vitamins and stay in a humidified room? (Humidity is supposed to be good to lower the chance of diseases maybe by keeping good bacteria around and let them outnumber bad ones. Not sure about viruses.) If I were 75, my risk profile might be different