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There are different kinds of H1N1 viruses, you can catch the exact same kind only once in your lifetime. The Type A, H1N1/09 influenza virus that caused the pandemic is different than other H1N1 viruses. So you could get infected by more than one type of H1N1 in your lifetime, but not the exact same Type A, H1N1/09.

Usually your body recognizes a very similar type of flu as the same and can prepare defenses for it quickly because of the prior immune response to the other one, but if different enough you will have to start over with a new immune response that allows time for the virus to make you feel ill before you can begin to "kill" the new type.

The answer is that you can catch the same one only once, but you can still catch all the other H1N1 viruses (one time each) after that.

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14y ago

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