Table 1.

H9N2 avian influenza virus (AIV) strains used in this study.

Isolate	Abbreviation	Host	Date of Isolation	Genbank Accession No.
A/Chicken/Henan/1283/2016	CK/HN/1283/16	Chicken	February 2016	MH375347-MH375354
A/Chicken/Shandong/1286/2016	CK/SD/1286/16	Chicken	April 2016	MH375359-MH375366
A/Chicken/Shandong/1287/2016	CK/SD/1287/16	Chicken	April 2016	MH375368-MH375375
A/Chicken/Shandong/3424/2016	CK/SD/3424/16	Chicken	June 2016	MH667569-MH667576
A/Chicken/Shandong/3426/2016	CK/SD/3426/16	Chicken	July 2016	MH667582-MH667589
A/Chicken/Shandong/3435/2017	CK/SD/3435/17	Chicken	January 2017	MH667590-MH667597
A/Duck/Shandong/1432/2017	DC/SD/1432/17	Duck	April 2017	MH375444-MH375451
A/Duck/Shandong/915/2017	DC/SD/915/17	Duck	May 2017	MH375378-MH375385
A/Duck/Shandong/Y1/2017	DC/SD/Y1/17	Duck	May 2017	MH375416-MH375423
A/Chicken/Shandong/3446/2017	CK/SD/3446/17	Chicken	May 2017	MH889082-MH889089
A/Chicken/Shandong/1635/2018	CK/SD/1635/18	Chicken	April 2018	MK367676-MK367683
A/Chicken/Shandong/1642/2018	CK/SD/1642/18	Chicken	April 2018	MK367685-MK367692
A/Chicken/Shandong/1646/2018	CK/SD/1646/18	Chicken	May 2018	MK367659-MK367666
A/Chicken/Shandong/1647/2018	CK/SD/1647/18	Chicken	May 2018	MK367667-MK367674
A/Chicken/Shandong/16587/2018	CK/SD/16587/18	Chicken	May 2018	MK367643-MK367650
A/Chicken/ShanXi/1757/2019	CK/SX/1757/19	Chicken	January 2019	MN780494-MN780501
A/Chicken/ShanXi/1784/2019	CK/SX/1784/19	Chicken	March 2019	MN780586-MN780593
A/Chicken/ShanXi/1807/2019	CK/SX/1807/19	Chicken	April 2019	MN780832-MN780839
A/Chicken/Shandong/1834/2019	CK/SD/1834/19	Chicken	May 2019	MN765112-MN765119
A/Chicken/Shandong/6F/2019	CK/SD/6F/19	Chicken	May 2019	MN759632-MN759639
A/Chicken/Shandong/1844/2019	CK/SD/1844/19	Chicken	June 2019	MN765144-MN765151