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The vaccine puts dead flu cells into your body. Because the cells are very weak, you immune system can completely kill that virus. After you immune system kills the virus, antibodies are still left over in your blood stream. So, if you are exposed to the flu, the already made antibodies can kill the flu virus before it spreads and gets too serious for your immune system to overcome.

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15y ago

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Does it do any good to take a vaccine once you are sick with the disease the vaccine is supposed to fight?

No, it doesn't, because the vaccine 'primes' the system for the virus. It won't help once you're already sick.


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Can a flu vaccine be given to a sick patient?

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