Can I bring home the swine flu even if I got vaccinated?

You see, in vaccination, a weak strain of the virus is being injected into you-- weak, so that your body will be able to effectively produce antibodies against that virus without the virus "attacking" your body. So now that you have antibodies against the virus, there is a lesser chance that the virus will affect you if ever you come in contact with it again (through your schoolmates). It's not a guarantee, but the odds are that your body will fight it off before you start showing signs & symptoms :)