Egyptian H5N1 influenza viruses-cause for concern?

[...]both studies, and findings by others [16]-[18], suggest that a shift towards human-type receptor-binding specificity may be necessary, but not sufficient, for H5N1 virus transmissibility in mammals. In the Herfst and Imai studies, loss of this glycosylation site occurred during the first virus passages in ferrets, suggesting that this trait is essential for H5 virus transmissibility in ferrets. Since lack of the HA154-156 glycosylation site appears to be critical for H5 virus transmission in mammals, we inspected avian H5N1 viruses for this feature.