Table 2. Comparison of the neuraminidase proteins of seasonal influenza A(H1N1) and A(H1N1)pdm09 viruses to the neuraminidase proteins of influenza A(H5N1) virus, Hong Kong, China.

Viruses	No. amino acid differences compared with Spoonbill/HK/22	Amino acid homology, %
A/USSR/90/1977	70	84.08
A/Chile/01/1983	68	84.58
A/Singapore/06/1986	68	84.58
A/Texas/36/1991	69	84.33
A/Brisbane/59/2007	76	83.83
A/California/04/2009	53	88.00