How do flu vaccines work?
The seasonal flu vaccine protects against the influenza viruses that research indicates will be most common during the upcoming season. Flu vaccines cause antibodies to develop in the body about two weeks after vaccination. These antibodies provide protection against infection with the viruses that are in the vaccine.

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1. How do I know that I have the flu?
2. How does the flu spread?
3. How long is a person with flu virus contagious?
4. Can the flu be treated?
5. Why should people get vaccinated against the flu?
6. When should I get a flu vaccine?
7. How do flu vaccines work?
8. Is the “stomach flu” really the flu?
9. How many people get the flu each year?
10. Do other respiratory viruses circulate during the flu season?
11. How soon will I get sick if I’m exposed to the flu?
12. How do scientists determine which strains to protect against in a flu vaccine?
13. Can a flu vaccine give you the flu?
14. Why do I feel sick after getting a flu shot?
15. Why did I still get sick even after I got a flu shot?
16. Do I need to get a flu vaccine every year, or will the immunity carry over from last year’s vaccine?
17. Is it ever too early or too late to get a flu vaccine?
18. How can I learn more about the progress of the flu season?