Live Poultry Market Closure and Control of Avian Influenza A(H7N9), Shanghai, China
2014; Centers for Disease Control and Prevention; Volume: 20; Issue: 9 Linguagem: Inglês
10.3201/eid2009.131243
ISSN1080-6059
AutoresYi He, Peihong Liu, Songzhe Tang, Yong Chen, Enle Pei, Baihui Zhao, Ren Hong, Jian Li, Yiyi Zhu, Hongjin Zhao, Qichao Pan, Bao-ke Gu, Zhengan Yuan, Fan Wu,
Tópico(s)Animal Disease Management and Epidemiology
ResumoTo the Editor: China reported its first human infections with avian influenza A(H7N9) virus in late March 2013 (1).In the following weeks, 131 human infections were confirmed; 33 occurred in Shanghai (http://www.moh.gov.cn).Because infection with this novel virus had a high fatality rate and posed a pandemic risk, Shanghai disease control authorities launched rapid investigations to identify the source of the infections.Migratory birds, mammals, poultry, and humans could be potential reservoirs of H7 subtype avian influenza viruses (2,3), so all of these possibilities were simultaneously evaluated immediately after the discovery of the novel virus.To investigate human-to-human transmission, we evaluated 45 close contacts of the first 6 reported casepatients.The only suspected humanto-human transmission was in 1 family cluster with 2 confirmed cases.Intensive follow-up monitoring (20 contacts of this cluster and 25 of the other 4 case-patients) did not identify any further infections, which suggests that sustained human-to-human transmission did not occur.Migratory birds are natural reservoirs for avian influenza viruses (2,4), and Shanghai is in the eastern Asia-Australian migratory shorebird flyway.Thus, transmission of these viruses from wild birds to humans is possible.The Shanghai forestry authority has conducted surveillance for influenza virus among migratory birds since 2004.During January 2010-April 2013, a total of 884 throat/cloacal swab, serum, and fecal samples from 496 birds were tested, and no infections with influenza viruses of subtypes H7 or N9 were found.After human infections with influenza
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