Table 1.
Gene constellations of different genotypes of the H9N2 AIVs
| Virus | Genotype | Genetic source* | |||||||
| PB2 | PB1 | PA | HA | NP | NA | M | NS | ||
| Ck/SD/WF/98 | B0 | BJ94 | BJ94 | BJ94 | G9 | BJ94 | Y280 | BJ94 | BJ94 |
| Ck/HLJ/u/98 | G2 | G1 | G1 | G1 | Nor A | Nor A | G9 | BJ94 | SH96 |
| Ck/SD/lx929/07 | B62 | F98 | BJ94 | Y439 | Y280 | F98 | G9 | BJ94 | SH96 |
| Ck/SD/lx1023/07 | B62 | F98 | BJ94 | Y439 | Y280 | F98 | G9 | BJ94 | SH96 |
| Ck/SD/LY-1/08 | B63 | F98 | BJ94 | H5N1 | Y280 | H5N1 | Y280 | BJ94 | SH96 |
| Ck/SD/BD/08 | B55 | F98 | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/KD/09 | B55 | F98 | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/02/08 | B64 | F98 | BJ94 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/01/09 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/02/09 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/H/09 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/BD/10 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/01/10 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/02/10 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
| Ck/SD/03/10 | B65 | H | F98 | F98 | Y280 | F98 | Y280 | G1 | F98 |
* PB, polymerase basic protein; PA, polymerase acidic protein; HA, hemagglutinin; NP, nucleocapsid protein; NA, neuraminidase; M, matrix; NS, nonstructural; BJ94, Ck/Bei-like (represented by A/Chicken/Beijing/1/94); Y280, Y280-like (represented by A/duck/Hong Kong/Y280/97); F98, F98-like (represented by A/Chicken/Shanghai/F/98); G1, G1-like (represented by A/Quail/Hong Kong/G1/97); G9, G9-like (represented by A/Chicken/Hong Kong/G9/97); Y439, Y439-like (represented by A/duck/Hong Kong/Y439/97); SH96, SH96-like (represented by A/Quail/Shanghai/8/96); H, unknown source and named as H-like (represented by A/chicken/Shandong/H/09); H5N1, H5N1-like.