Human infection with avian influenza A(H7N9) virus re-emerges in China in winter 2013

E Chen; Y Chen; L Fu; Z Chen; Z Gong; H Mao; D Wang; M Y Ni; P Wu; Z Yu; T He; Z Li; J Gao; S Liu; Y Shu; B J Cowling; S Xia; H Yu

doi:10.2807/1560-7917.ES2013.18.43.20616

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Human infection with avian influenza A(H7N9) virus re-emerges in China in winter 2013
E Chen^1,2 , Y Chen^1,2 , L Fu^2,3 , Z Chen¹ , Z Gong¹ , H Mao¹ , D Wang⁴ , M Y Ni⁵ , P Wu⁵ , Z Yu¹ , T He³ , Z Li¹ , J Gao¹ , S Liu¹ , Y Shu⁴ , B J Cowling⁵ , S Xia¹ , H Yu⁶
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Affiliations: ¹ Department of Infectious Diseases, Zhejiang Provincial Centre for Disease Control and Prevention, Hangzhou, Zhejiang Province, China ² These authors contributed equally to this work ³ Department of Infectious Diseases, Shaoxing Centre for Disease Control and Prevention, Shaoxing, Zhejiang Province, China ⁴ National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Key Laboratory for Medical Virology, National Health and Family Planning Commission, Beijing, China ⁵ School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China ⁶ Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China

Correspondence:
S Xia
shchxia cdc.zj.cn
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Citation style for this article: Chen E, Chen Y, Fu L, Chen Z, Gong Z, Mao H, Wang D, Ni M Y, Wu P, Yu Z, He T, Li Z, Gao J, Liu S, Shu Y, Cowling B J, Xia S, Yu H. Human infection with avian influenza A(H7N9) virus re-emerges in China in winter 2013. Euro Surveill. 2013;18(43):pii=20616. https://doi.org/10.2807/1560-7917.ES2013.18.43.20616 Received: 18 Oct 2013

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Abstract

Through a national surveillance system for unexplained pneumonia, a severe case of influenza A(H7N9) in a man in his mid-30s was identified in Zhejiang Province, China on 14 October 2013. Epidemiological and clinical findings were consistent with the patterns reported during the outbreak in spring 2013, and laboratory findings showed that the virus had 99.6% identity with earlier H7N9 viruses identified in humans in the spring except for five mutations in the NA gene.