Is there any scientific proof that the flu shot works?

Yes: And annual data is generated on how protective a given year's flu vaccine is. Influenza kills anywhere from a couple of thousand to forty thousand people in the us every year. Flu can be deadly, so it's smart to get the shot.

Yes: Each year there are at least 4-6 different strains circling the globe & air travel spreads it quickly. Only 3-4 strains can be put into the yearly shot without weakening the protection for each strain. These are picked by amount of world activity. There is always a chance someone who gets the shot can get a flu strain not in the vaccine but it protects for most.

Evidence:little help: The best evidence suggests the flu shot has minimal if any benefits.The mainstream Cochrane Collaboration analyzed the research and found 71 adults would have to be vaccinated to prevent 1 case of flu and no proof it reduces days lost from work,hospitalizations or deaths! Other studies show it increases chances of getting strains of flu not in the vaccine and other flu-like infections.See comment: