Can immunity induced by the human influenza virus N1 neuraminidase provide some protection from avian influenza H5N1 viruses?

Gillim-Ross and Subbarao discuss a new study inPLoS Medicine that suggests that immunity to the human influenza virus N1 NA cross-reacts with the avian N1 NA, and that this cross-reactivity may be sufficient to protect against infection with avian influenza virus H5N1.