The antibodies people produce after being infected by this new seasonal H1N1 do not protect against 2009 H1N1.

The antibodies that had protected a lot of Europeans the previous winter no longer worked against this "drifted" strain of H3N2.

We have learned a lot from this research about how to induce the production of the protective abzymes on demand. This is the Holy Grail of HIV research -- development of a preventative HIV vaccine.