Table 3.

Genetic relationship between H9N2 and H5N1 viruses

Percent homology with A/HK/1073/99*
Gene	A/HK/97 (H5N1)†	Qa/HK/ G1/97	Ck/HK/ G9/97	Dk/HK/ Y280/97
PB2	98	99	97	85
PB1	99	99	98	90
PA	98	99	89	90
H9	–	99	92	91
NP	99	99	90	90
N2	–	99	93	94
M	98	99	96	96
NS	98	100	93	93

^*Similar relationships were obtained in comparisons with genes of A/HK/1074/99. Homology between the eight genes of A/HK/1073/99 and A/HK/1074/99 was 99% or greater. 

^† Sequences used in these comparisons were PB2 and M of A/HK/485/97, PB1, PA, and NS of A/HK/156/97, and NP of A/HK/481/97.