Vitamim D3 and its affectiveness as a deterrant to influenza are becoming widely known. It is nice to know that there is an alternative, particularly if someone cannot use D3 or EP67.
Vitamin D3 Replaces Flu Shot
http://healthynutrition.me/?p=113
The onsets of many health conditions and diseases related to weakend immune systems can be traced directly to VitD3 deficiencies, which is more prevalent than has been given credit for previously. The U.S. governmetn has recently raised the VitD3 RDA but it still seems insufficiently low for much of the population.
Higher Vitamin D Levels Linked to Fewer Infections - FR / TET, by Dr. John Briffa, 2010 July 10
Vitamin D Deficiency Linked to Diabetes, Metabolic Syndrome in Studies - FR / NIH, 2010 June 20
The value of EP67 seems to be that it can act post-facto of infection, so it can act as antidote or emergency agent - "... researchers said that mice infected with a lethal dose of influenza did not die after receiving the protein."