UPDATE on "My personal H1N1 Vaccination Experiences"

Today, my mother is feeling slightly better, yet still has fever and all the symptoms she had. Additional to her now everyone in my Family has become sick, both sisters, my mother and my stepfather. I am the only one who doesn't show any signs of negative Side effects to the vaccination. Slowly the question arises in my head why it is this way?
Why have I not felt anything negative happen to me? What differs me from ym parents and family in this?
-PAKd