Case-control study of risk factors for human infection with influenza A(H7N9) virus in Jiangsu Province, China, 2013

J Ai; Y Huang; K Xu; D Ren; X Qi; H Ji; A Ge; Q Dai; J Li; C Bao; F Tang; G Shi; T Shen; Y Zhu; M Zhou; H Wang

doi:10.2807/1560-7917.ES2013.18.26.20510

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Case-control study of risk factors for human infection with influenza A(H7N9) virus in Jiangsu Province, China, 2013
J Ai¹ , Y Huang^2,3 , K Xu¹ , D Ren^3,4 , X Qi¹ , H Ji¹ , A Ge¹ , Q Dai¹ , J Li¹ , C Bao¹ , F Tang¹ , G Shi³ , T Shen³ , Y Zhu¹ , M Zhou¹ , H Wang¹
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Affiliations: ¹ Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China ² Tongling Center for Disease Control and Prevention, Tongling, Anhui, China ³ Chinese Field Epidemiology Training Program, Chinese Center for Disease Control and Prevention, Beijing, China ⁴ Tongren Center for Disease Control and Prevention, Tongren, Guizhou, China

Correspondence:
Y Zhu
jszyf jscdc.cn
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Citation style for this article: Ai J, Huang Y, Xu K, Ren D, Qi X, Ji H, Ge A, Dai Q, Li J , Bao C, Tang F, Shi G, Shen T, Zhu Y, Zhou M, Wang H. Case-control study of risk factors for human infection with influenza A(H7N9) virus in Jiangsu Province, China, 2013. Euro Surveill. 2013;18(26):pii=20510. https://doi.org/10.2807/1560-7917.ES2013.18.26.20510 Received: 01 Jun 2013

Abstract

We describe a case-control study performed in Jiangsu, China, to evaluate risk factors for human infection with novel avian influenza A(H7N9) virus. Twenty-five cases and 93 controls matched by age, sex, and location were included in the study. Direct contact with poultry or birds in the two weeks before illness onset, chronic medical conditions (hypertension excluded), and environment-related exposures were significantly associated with A(H7N9) infection.