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

Lei Zhou; Ruiqi Ren; Lei Yang; Changjun Bao; Jiabing Wu; Dayan Wang; Chao Li; Nijuan Xiang; Yali Wang; Dan Li; Haitian Sui; Yuelong Shu; Zijian Feng; Qun Li; Daxin Ni

doi:10.5365/wpsar.2017.8.1.001

Western Pacific Surveillance and Response (Jan 2017)

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

Lei Zhou,
Ruiqi Ren,
Lei Yang,
Changjun Bao,
Jiabing Wu,
Dayan Wang,
Chao Li,
Nijuan Xiang,
Yali Wang,
Dan Li,
Haitian Sui,
Yuelong Shu,
Zijian Feng,
Qun Li,
Daxin Ni

Affiliations

Lei Zhou: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Ruiqi Ren: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Lei Yang: Chengdu Prefecture Center for Disease Control and Prevention, Sichuan, China
Changjun Bao: Jiangsu Provincial Center for Disease Control and Prevention, Jiangsu, China
Jiabing Wu: Anhui Provincial Center for Disease Control and Prevention, Anhui, China
Dayan Wang: Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
Chao Li: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Nijuan Xiang: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Yali Wang: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Dan Li: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Haitian Sui: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Yuelong Shu: Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
Zijian Feng: Chinese Center for Disease Control and Prevention, Beijing, China
Qun Li: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China
Daxin Ni: Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China

DOI: https://doi.org/10.5365/wpsar.2017.8.1.001
Journal volume & issue: Vol. 8, no. 1
pp. 6 – 14

Abstract

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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.

Published in Western Pacific Surveillance and Response

ISSN: 2094-7321 (Print); 2094-7313 (Online)
Publisher: World Health Organization Regional Office for the Western Pacific
Country of publisher: Philippines
LCC subjects: Medicine: Public aspects of medicine
Website: https://ojs.wpro.who.int/ojs/index.php/wpsar

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