Has Epizootic Become Enzootic? Evidence for a Fundamental Change in the Infection Dynamics of Highly Pathogenic Avian Influenza in Europe, 2021

Author:

Pohlmann Anne1,King Jacqueline1,Fusaro Alice2,Zecchin Bianca2,Banyard Ashley C.34ORCID,Brown Ian H.34,Byrne Alexander M. P.3,Beerens Nancy5ORCID,Liang Yuan6,Heutink Rene5,Harders Frank5,James Joe34ORCID,Reid Scott M.3,Hansen Rowena D. E.3,Lewis Nicola S.7,Hjulsager Charlotte8,Larsen Lars E.6,Zohari Siamak9,Anderson Kristofer9,Bröjer Caroline10,Nagy Alexander11,Savič Vladimir12,van Borm Steven13ORCID,Steensels Mieke13,Briand Francois-Xavier14,Swieton Edyta15,Smietanka Krzysztof15,Grund Christian1,Beer Martin1ORCID,Harder Timm1ORCID

Affiliation:

1. Institute of Diagnostic Virology, Friedrich Loeffler Institute, Greifswald-Insel Riems, Germany

2. European Union Reference Laboratory for Avian Influenza and Newcastle Disease, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Padua, Italy

3. Animal and Plant Health Agency—Weybridge, New Haw, Addlestone, Surrey, United Kingdom

4. OIE/FAO International Reference Laboratory for Avian Influenza, Swine Influenza and Newcastle Disease, Animal and Plant Health Agency—Weybridge, Addlestone, Surrey, United Kingdom

5. Wageningen Bioveterinary Research, Lelystad, The Netherlands

6. Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark

7. Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom

8. Department for Virus and Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark

9. Department of Microbiology, National Veterinary Institute, SVA, Uppsala, Sweden

10. Department of Pathology, National Veterinary Institute, SVA, Uppsala, Sweden

11. State Veterinary Institute Prague, Prague, Czech Republic

12. Croatian Veterinary Institute, Poultry Centre, Zagreb, Croatia

13. Service of Avian Virology and Immunology, Sciensano, Brussels, Belgium

14. Agence Nationale de Sécurité Sanitaire, de l’Alimentation, de l’Environnement et du Travail, Laboratoire de Ploufragan-Plouzané-Niort, Unité de Virologie, Immunologie, Parasitologie Avaires et Cunicoles, Ploufragan, France

15. Department of Poultry Diseases, National Veterinary Research Institute, Puławy, Poland

Abstract

Phylogenetic evidence from the recent resurgence of high-pathogenicity avian influenza (HPAI) virus subtype H5N1, clade 2.3.4.4b, observed in European wild birds and poultry since October 2021, suggests at least two different and distinct reservoirs. We propose contrasting hypotheses for this emergence: (i) resident viruses have been maintained, presumably in wild birds, in northern Europe throughout the summer of 2021 to cause some of the outbreaks that are part of the most recent autumn/winter 2021 epizootic, or (ii) further virus variants were reintroduced by migratory birds, and these two sources of reintroduction have driven the HPAI resurgence.

Funder

EC | Horizon 2020 Framework Programme

Bundesministerium für Bildung und Forschung

Publisher

American Society for Microbiology

Subject

Virology,Microbiology

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