Table 1 The amino acid change sites of HA1 and NA of Victoria-lineage virus. Representative strain is randomly one of strains circulating in every surveillance season.

From: Molecular evolution of influenza B virus during 2011–2017 in Chaoyang, Beijing, suggesting the free influenza vaccine policy

Representative strain

HA1

NA

58

117

129

146

171

184

189

41

42

45

120

220

295

340

358

*B/Brisbane/60/2008

L

I

N

I

N

G

T

S

P

I

I

K

S

N

E

B/Beijing-Chaoyang/2/2011

P

—

S

V

—

—

—

—

—

—

—

—

—

D

—

B/Beijing-Chaoyang/394/2012

P

—

S

V

D

E

—

P

S

—

—

N

—

D

A

B/Beijing-Chaoyang/167/2015

P

—

S

V

—

—

—

—

—

—

—

—

R

D

K

B/Beijing-Chaoyang/946/2016

—

V

D

—

—

—

A

—

—

T

V

N

R

D

K

B/Beijing-Chaoyang/1047/2017

—

V

D

—

—

—

—

—

—

—

—

N

R

D

A

  1. * represents vaccine virus strains. “—” represents the same amino acids comparing to the same region of vaccine virus strains.
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