Quote Originally Posted by Rawhide View Post
There are many different strains of influenza (thousands), and the yearly flu vaccine can only protect against so many (around 5). The researchers try to predict which strains will be the most likely to hit your area and protect against them. As you can see, there's still plenty of chance to be infected by one of the many different strains. But, having the shot will partially help you against other strains and greatly help you against the worst/most likely strains.
It's all lies! It's just a ruse so that The Man can inject you with their mind-controlling nanobots

I have heard somewhere that there are new strains of flu pretty much every season, and the shot that might protect you from flu at the start of Winter might not protect you from flu at the end of Winter. I'm not sure how factual that is, though.