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. 2017 Jan 18;8(1):6-14.
doi: 10.5365/WPSAR.2017.8.1.001. eCollection 2017 Jan-Mar.

Sudden increase in human infection with avian influenza A(H7N9) virus in China, September-December 2016

Lei Zhou  1 , Ruiqi Ren  1 , Lei Yang  2 , Changjun Bao  3 , Jiabing Wu  4 , Dayan Wang  5 , Chao Li  1 , Nijuan Xiang  1 , Yali Wang  1 , Dan Li  1 , Haitian Sui  1 , Yuelong Shu  5 , Zijian Feng  6 , Qun Li  1 , Daxin Ni  1
Affiliations

Sudden increase in human infection with avian influenza A(H7N9) virus in China, September-December 2016

Lei Zhou et al. Western Pac Surveill Response J. .

Abstract

Since the first outbreak of avian influenza A(H7N9) virus in humans was identified in 2013, there have been five seasonal epidemics observed in China. An earlier start and a steep increase in the number of humans infected with H7N9 virus was observed between September and December 2016, raising great public concern in domestic and international societies. The epidemiological characteristics of the recently reported confirmed H7N9 cases were analysed. The results suggested that although more cases were reported recently, most cases in the fifth epidemic were still highly sporadically distributed without any epidemiology links; the main characteristics remained unchanged and the genetic characteristics of virus strains that were isolated in this epidemic remained similar to earlier epidemics. Interventions included live poultry market closures in several cities that reported more H7N9 cases recently.

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Figures

Figure 1a
Figure 1a
Geographic distribution of human infection with H7N9 virus in China [excluding Hong Kong SAR (China), Macao SAR (China) and Taiwan, China], February 2013–December 2016
Figure 1b
Figure 1b
Epidemic curve of human infection with H7N9 virus in China [excluding Hong Kong SAR (China), Macao SAR (China) and Taiwan, China] by week, February 2013–December 2016
Figure 1c
Figure 1c
Geographic distribution of human infection with H7N9 virus in China [excluding Hong Kong SAR (China), Macao SAR (China) and Taiwan, China], September 2016–December 2016
Figure 1d
Figure 1d
Epidemic curve of human infection with H7N9 virus in China [excluding Hong Kong SAR (China), Macao SAR (China) and Taiwan, China] by day, September 2016–December 2016
See this image and copyright information in PMC

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