Western Pacific Surveillance and Response

Human infection with avian influenza A(H7N9) virus in China

Emerging Disease Surveillance and Response Teama

a Division of Health Security and Emergencies, World Health Organization Regional Office for the Western Pacific, Manila, Philippines.


We report on the current human infection with avian influenza A(H7N9) virus in China. As of 18 April 2013, there have been 82 confirmed cases, with 17 deaths (CFR 19%). The cases are in six provinces: Shanghai (31 cases [11deaths]), Jiangsu (20[3]), Zhejiang (25[2]), Anhui (3[1]), Henan (2[0]) and Beijing (1[0]) (Figure 1). There is no evidence of sustained human to human transmission, although investigations are ongoing. The exact source of infection, reservoir and mode of transmission of the H7N9 virus is still being investigated. Until the source of infection is identified, further cases are expected in China.


Figure 1. Map of the number of cases and deaths from infection with avian influenza A(H7N9) virus by province, China, February to April 2013

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e-ISSN: 2094-7313
p-ISSN: 2094-7321


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World Health Organization
Western Pacific Regional Office
P.O. Box 2932
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Philippines
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