Yes you can get the flu again. Viruses change and mutate. If you get the swine flu (H1N1) and get treated/recover, your body's immune system will recognize that particular virus and take care of any virus it finds that are H1N1.
However, if the virus changes to the point that your immune system no longer recognizes it and you get reinfected, you will get the flu/flu symptoms again but it will be from a different strain of the flu. See the link below to the CDC for more information. cdc.gov/flu/about/viruses/change.htm.
The swine flu is only one strain of influenza. Just like we have to get a new flu shot every year, it won't protect against this. Influenza is mutating constantly.
That is why we need to get a new flu shot every year. Even if we get the flu, it doesn't mean we're immune to it the next time it comes around.
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