you can also go to a witchdoctor for a cure to stop things from falling on your head, and claim great success when nothing falls on your head
in my personal experience, i have had 5 people, all close to me, get extremely sick after getting the flu vaccine. not enough to kill you but it knocks you down, and i don't believe 5 people are a coincidence, with me also personally having received a flu vaccine and gotten extremely sick afterwards whereas i normally never get sick.
perhaps it is coincidence that i got sick right after the shot, but i still believe healthy eating and a hygienic environment go further. i also know that we have different levels of exposure to people on a day to day basis, so some of us tend to shake hands or touch more keyboards than most other people, a flu vaccine can only do so much
my friend who is a biologist also assured me that it's one of the few vaccines that are a waste of time, but if you get it and get sick, the likelihood of you getting sick from your second, third and forth are highly unlikely