If you got vaccinated against the swine flu this time around you may be protected against the 1918 pandemic strain:

http://blogs.discovermagazine.com/notroc...st-1918-strain/

Yes, mice are not people, and there is always the chance the vaccine didn't take when you got it, a 2% to 10% chance by some accounts, but between partial immunity and the beneficial effects of herd immunity this is still a good thing. It means that there is a good chance that if and when the 1918 strain pops up, it is still out there, it may both spread more slowly and be less deadly.

A happy bonus for getting vaccinated.