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Table 1 Summary of antigenic analysis of B/Victoria lineage viruses isolated in the mainland of China by month during 2020 and 2021

From: Epidemiological and virological surveillance of influenza viruses in China during 2020–2021

Collection time

Reference Ferret Antisera

B/Washington/02/2019 (1A.3)

B/Sichuan-Jingyang/12048/2019 (1A.3a.1)

B/Austria/1359417/2021 (1A.3a.2)

No. of likea(%)

No. of lowb (%)

Total

No. of like (%)

No. of low (%)

Total

No. of like (%)

No. of low (%)

Total

2020.1

181 (96.3)

7 (3.7)

188

0 (0)

1 (100)

1

2020.2

29 (87.9)

4 (12.1)

33

0 (0)

3 (100)

3

2020.3

22 (84.6)

4 (15.4)

26

0 (0)

3 (100)

3

2020.4

4 (100)

0 (0)

4

0 (0)

1 (100)

1

2020.5

4 (100)

0 (0)

4

1 (25.0)

3 (75.0)

4

2020.6

4 (100)

0 (0)

4

0 (0)

4 (100)

4

2020.7

0 (0)

1 (100)

1

1 (100)

0 (0)

1

2020.8

0 (0)

2 (100)

2

2 (100)

0 (0)

2

2020.9

0 (0)

3 (100)

3

3 (100)

0 (0)

3

2020.10

4 (80.0)

1 (20.0)

5

2 (40.0)

3 (60.0)

5

2020.11

17 (73.9)

6 (26.1)

23

18 (78.3)

5 (21.7)

23

2020.12

30 (30.9)

67 (69.1)

97

97 (100)

0 (0)

97

2021.1

79 (36.1)

140 (63.9)

219

212 (96.8)

7 (3.2)

219

2021.2

105 (68.2)

49 (31.8)

154

138 (89.6)

16 (10.4)

154

2021.3

153 (48.4)

163 (51.6)

316

245 (77.5)

71 (22.5)

316

2021.4

88 (28.0)

226 (72.0)

314

267 (85.0)

47 (15.0)

314

2021.5

90 (30.0)

210 (70.0)

300

231 (77.0)

69 (23.0)

300

2021.6

73 (29.3)

176 (70.7)

249

173 (69.5)

76 (30.5)

249

2021.7

48 (24.7)

146 (75.3)

194

93 (47.9)

101 (52.1)

194

2021.8

76 (35.7)

137 (64.3)

213

55 (25.8)

158 (74.2)

213

2 (100)

0 (0)

2

2021.9

147 (48.8)

154 (51.2)

301

132 (43.9)

169 (56.1)

301

117 (84.2)

22 (15.8)

139

2021.10

110 (32.4)

230 (67.6)

340

147 (43.2)

193 (56.8)

340

307 (90.3)

33 (9.7)

340

2021.11

155 (23.2)

512 (76.8)

667

172 (25.8)

495 (74.2)

667

581 (87.1)

86 (12.9)

667

2021.12

161 (30.7)

364 (69.3)

525

152 (29.0)

373 (71.0)

525

467 (89.0)

58 (11.0)

525

Total

1582 (37.8)

2602 (62.2)

4182

2141 (54.4)

1798 (45.6)

3939

1474 (88.1)

199 (11.9)

1673

  1. “–”: Tests not performed
  2. aLess than or equal to fourfold compared to homologous HI titers
  3. bMore than or equal to eightfold compared to homologous HI titers