Role for migratory wild birds in the global spread of avian influenza H5N8
Migration of influenza in wild birds
Virus surveillance in wild birds could offer an early warning system that, combined with adequate farm hygiene, would lead to effective influenza control in poultry units. The Global Consortium for H5N8 and Related Influenza Viruses found that the H5 segment common to the highly pathogenic avian influenza viruses readily reassorts with other influenza viruses (see the Perspective by Russell). H5 is thus a continual source of new pathogenic variants. These data also show that the H5N8 virus that recently caused serious outbreaks in European and North American poultry farms came from migrant ducks, swans, and geese that meet at their Arctic breeding grounds. Because the virus is so infectious, culling wild birds is not an effective control measure.
Abstract
Avian influenza viruses affect both poultry production and public health. A subtype H5N8 (clade 2.3.4.4) virus, following an outbreak in poultry in South Korea in January 2014, rapidly spread worldwide in 2014–2015. Our analysis of H5N8 viral sequences, epidemiological investigations, waterfowl migration, and poultry trade showed that long-distance migratory birds can play a major role in the global spread of avian influenza viruses. Further, we found that the hemagglutinin of clade 2.3.4.4 virus was remarkably promiscuous, creating reassortants with multiple neuraminidase subtypes. Improving our understanding of the circumpolar circulation of avian influenza viruses in migratory waterfowl will help to provide early warning of threats from avian influenza to poultry, and potentially human, health.
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Supplementary Material
Summary
Materials and Methods
Figs. S1 to S6
Tables S1 to S10
Movie S1
Resources
References and Notes
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Information & Authors
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Published In

Science
Volume 354 | Issue 6309
14 October 2016
14 October 2016
Copyright
Copyright © 2016, American Association for the Advancement of Science.
Submission history
Received: 21 April 2016
Accepted: 7 September 2016
Published in print: 14 October 2016
Acknowledgments
This study was financially supported by the European Commission H2020 program under contract number 643476 (www.compare-europe.eu) (to A.P., J.B., A.B., I.B., M.P.K., A.R., R.A.M.F., M.B., M.W., and T.K.), European Commission FP7 program under contract number 278433 (PREDEMICS) (to A.R.), the U. S. Geological Survey Ecosystems Mission Area (to H.S.I.), National Institutes of Health grant number 1R01AI101028-02A1 (to M.G.), United Kingdom Research Council Environmental and Social Ecology of Human Infectious Diseases UrbanZoo program (G1100783/1), Biotechnology and Biological Sciences Research Council (BBSRC) Zoonoses in Livestock in Kenya ZooLinK (BB/L019019/1) programs (to T.P.R. and M.W.), CGIAR Research Programme on Agriculture for Nutrition and Health (A4NH) (to T.P.R.), Canadian Food Inspection Agency (to J.P.), Hungarian Academy of Sciences Lendület (Momentum) program (to K.B.) and the Wellcome Trust (grant number 093724/B/10/Z) (to M.W. and A.R.). S.J.L. is supported by the University of Edinburgh Chancellor’s Fellowship scheme, the Roslin Institute BBSRC strategic program grant (BB/J004227/1), and the Centre of Expertise in Animal Disease Outbreaks (EPIC). We gratefully acknowledge the the originating laboratories, where specimens were first obtained, and the submitting laboratories, where sequence data were generated and submitted to the EpiFlu Database of the Global Initiative on Sharing All Influenza Data (GISAID), on which this research is based. All contributors of data may be contacted directly via the GISAID website (http://platform.gisaid.org). The accession numbers (GenBank, GISAID, and/or workset identification numbers) of all genetic sequences used in this study are provided in table S9 and are accessible from the website of GISAID (http://platform.gisaid.org). We acknowledge Y. Berhane and T. Hisanaga for sequencing the Canadian virus isolates and G. Koch for his technical advice on the poultry outbreaks in the Netherlands. The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication. Any use of trade products or firm names is for descriptive purposes and does not imply endorsement by the U.S. government.
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