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Table 1 Genotypes of H9N2 subtype avian influenza viruses in China.

From: Current situation of H9N2 subtype avian influenza in China

Genotype Emerged year Gene constellation References
PB2 PB1 PA HA NP NA M NS
A 1994 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 [29]
B 1997 G1/97 G1/97 BJ/94 BJ/94 BJ/94 G9/97 BJ/94 BJ/94
C 1999 G1/97 G1/97 G1/97 BJ/94 BJ/94 G9/97 BJ/94 G1/97
D 1999 G1/97 G1/97 G1/97 BJ/94 BJ/94 BJ/94 BJ/94 G1/97
E 2000 G1/97 G1/97 G1/97 TY/WI/66 TY/WI/66 G9/97 BJ/94 BJ/94
F 2000 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 G9/97 BJ/94 BJ/94
G 2000 G1/97 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94
H 1998 F/98 F/98 F/98 BJ/94 F/98 BJ/94 BJ/94 BJ/94
I 2001 F/98 F/98 F/98 BJ/94 F/98 G9/97 BJ/94 BJ/94
J 1999 F/98 F/98 F/98 BJ/94 F/98 BJ/94 BJ/94 d73/76 [26]
K 2003 BJ/94 BJ/94 Kor/323/96 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94
L 2005 F/98 F/98 F/98 BJ/94 F/98 BJ/94 BJ/94 Kor/323/96
M 1998 BJ/94 BJ/94 F/98 BJ/94 BJ/94 BJ/94 BJ/94 BJ/94 [39]
N 2007 BJ/94 F/98 F/98 BJ/94 F/98 BJ/94 BJ/94 BJ/94
O 2007 F/98 F/98 F/98 BJ/94 F/98 BJ/94 G1/97 BJ/94
P 2008 F/98 F/98 F/98 BJ/94 F/98 G9/97 G1/97 BJ/94
Q 2008 F/98 BJ/94 Y439/97 BJ/94 F/98 G9/97 G1/97 BJ/94
R 2007 F/98 F/98 Y439/97 BJ/94 F/98 BJ/94 G1/97 BJ/94 [7]
S 2007 G1/97 F/98 F/98 BJ/94 F/98 BJ/94 G1/97 BJ/94
T 2008 F/98 BJ/94 F/98 BJ/94 F/98 G9/97 G1/97 BJ/94
U 2009 G1/97 BJ/94 Y439/97 BJ/94 F/98 G9/97 G1/97 BJ/94
V 2014 G1/97 F/98 F/98 BJ/94 F/98 G9/97 G1/97 BJ/94 [40]
W 2014 Wild Waterfowls F/98 F/98 BJ/94 F/98 F/98 G1/97 BJ/94
  1. Genotypes were defined according to the array mode of the eight gene phylogenies, those which have or had persisted for a long time in China are labeled in bold
  2. BJ/94: A/chicken/Beijing/1/1994(H9N2)-like; G1/97: A/quail/Hong Kong/G1/1997(H9N2)-like; G9/97: A/chicken/Hong Kong/G9/1997(H9N2)-like; Y439/97: A/duck/Hong Kong/Y439/1997(H9N2)-like; TY/WI/66: A/turkey/Wisconsin/1/1966(H9N2)-like; F/98: A/chicken/Shanghai/F/1998(H9N2)-like; Kor/323/96: A/chicken/Korea/38349-p96323/1996(H9N2)-like; d73/76: A/duck/Hong Kong/d73/1976(H6N1)-like