How effective is the flu shot?

How well the flu vaccine works (or its ability to prevent flu illness) can range widely from season to season. In general, recent studies have supported the conclusion that flu vaccination benefits public health, especially when the flu vaccine is well matched to circulating flu viruses.

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1. What is seasonal flu?
2. How can I protect myself and my family from the flu?
3. Who should get vaccinated this season?
4. How effective is the flu shot?
5. What are the risks from getting a flu shot?
6. What are the side effects that could occur?
7. Can the flu shot give me the flu?
8. Why do some people not feel well after getting the flu shot?
9. What about people who get a seasonal flu vaccine and still get sick with flu-like symptoms?