randenburg,2 Ronald Vogels,2 Just P.J. Brakenhof1,2 Ronald Kompier,2f Martin H. Koldijk,z Lisette A.H.M. Comelissen,1 Leo L. M. Poon,4 Malik Peiris,` Wouter Koudstaal,zt Ian A. Wilson,l'st Jaap Goudsmit2 Current flu vattines provide only limited coverage against seasonal strains of influenza viruses. The identific