KSarty said:
You keep using that word. I do not think it means what you think it means. I vaccine doesn't STOP you getting the disease, it just amplifies your immune response if you get exposed. In most cases you'll completely annihilate the pathogen and won't develop the disease.
Yes, every year people do get the flu despite the vaccine. Maybe the virus mutates. (Hah! Maybe. Statistically, every single flu particle produced will have 1 mutation. So yes, the virus mutates) or maybe their immune system sucks. Doesn't mean the vaccine is worthless. Imagine how many more people would get the flu without the vaccine.