I've tried to take as unbiased an approach as possible to researching and analyzing this question, but I've found reliable data hard to find. My personal experience is that the only time I got the flu shot I ended up in hospital! I was in my late forties or early fifties then and haven't had a flu shot since, and haven't gotten the flu or a cold since. I found one website that stated that the big pharmaceutical companies charged Ontario slightly over a billion dollars for vaccine. That's not huge money to the major pharmaceutical companies but it's money that's being spent by our governments on, as far as I can determine, a less than provable benefit to our citizens.