Can I spread the flu if I don't have any symptoms?

Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 days after becoming sick. That means that you may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick.

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1. Can the flu vaccine give you the flu?
2. Are the "stomach flu" and influenza the same thing?
3. Is December or later too late to get the flu vaccine?
4. I got the flu vaccine last year, do I need to get it again?
5. Is hand washing the best way to prevent the spread of the flu?
6. How is the flu virus spread?
7. People get the flu all the time. It's not that serious, right?
8. I hate shots, is there another way I can get the vaccine?
9. Can I spread the flu if I don't have any symptoms?