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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