Phylogenetic Analysis of Hemagglutinin Genes of H9N2 Avian Influenza Viruses Isolated from Chickens in Shandong, China, between 1998 and 2013

Table 2

Similarity analysis of HA nucleotide sequence and deduced amino acid sequence of H9N2 AIVs and vaccine strains.

	Virus	Nucleotide sequence	Amino acid sequence
Vaccine strains	35 H9N2 AIVs in this study	84.0–100.0%	89.1–100.0%
	A/chicken/Guangdong/SS/1994	86.2–92.1%	83.6–87.5%
	A/chicken/Shandong/6/1996	84.5–91.4%	86.7–89.2%
	A/chicken/Shanghai/F/1998	84.0–93.0%	87.7–92.2%