Are they so sure there is no harm in taking this virus vaccine?

How safe are any vaccines any longer. Just last night I watched the horrible story about the young girl who had a debilitating reaction to a flu vaccine and she is not crippled. She has some ultra rare nervous disorder where she can barely walk but its not as bad when she runs or walks backwards. Are there more stories like hers that never get out or are explained away as something else?

in reference to:

""Because there's no harm in getting the vaccine even if you think you had [swine flu], we err on the side of caution and say you should get the vaccine," Dr. Poland says."
- Two Flu Vaccines, Lots of Questions - WSJ.com (view on Google Sidewiki)