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Table 1 Annual summary of influenza activity in Shanghai, China from 2010 to 2015

From: Excess pneumonia and influenza mortality attributable to seasonal influenza in subtropical Shanghai, China

 

2010

2011

2012

2013

2014

2015

Total specimens

12,992

10,114

11,828

15,452

19,514

19,908

Positive number

 A (H1N1)

551

760

6

470

853

618

 A (H3N2)

802

75

2375

1745

2719

2863

 B (Victoria)

1493

801

1774

19

17

21

 B (Yamagata)

408

425

73

57

1411

2007

Positive Proportion

 A (H1N1)

4.24

7.51

0.05

3.04

4.37

3.10

 A (H3N2)

6.17

0.74

20.08

11.29

13.93

14.38

 B (Victoria)

11.49

7.92

15.00

0.12

0.09

0.11

 B (Yamagata)

3.14

4.20

0.62

0.37

7.23

10.08

LAB × ILI

 A (H1N1)

30.38

64.06

0.30

23.72

42.81

23.79

 A (H3N2)

48.89

4.92

166.55

82.29

133.77

150.13

 B (Victoria)

73.49

44.46

104.27

0.84

0.65

0.85

 B (Yamagata)

19.64

24.59

4.20

2.85

53.31

79.78

Predominant subtype/lineage

B (Victoria)

A (H1N1); B (Victoria)

A (H3N2);

B (Victoria)

A (H3N2)

A (H3N2)

A (H3N2);

B (Yamagata)

  1. LAB × ILI product of weekly proportion of specimens tested positive for influenza and influenza-like illness consultation rate