Avian influenza overview – update on 19 November 2020, EU/EEA and the UK

• Published in: EFSA Journal
• Main Authors: European Food Safety Authority, European Centre for Disease Prevention Control and European Union Reference Laboratory for Avian Influenza, Cornelia Adlhoch, Alice Fusaro, José L Gonzales, Thijs Kuiken, Stefano Marangon, Éric Niqueux, Christoph Staubach, Krzysztof Smietanka, Calogero Terregino, Yves Van der Stede, Inma Aznar, Francesca Baldinelli
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2020
• Subjects: avian influenza; HPAI/LPAI; monitoring; poultry; captive birds; wild birds; Nutrition. Foods and food supply; TX341-641; Chemical technology; TP1-1185; Barnacle goose
• Online Access: https://doi.org/10.2903/j.efsa.2020.6341; https://doaj.org/article/d165f18611ca40af8eb60859eb0b2e35

Since 16 October 2020, outbreaks ofhighly pathogenic avian influenza (HPAI) viruseshavebeen reported inseveral EU/EEAcountries –Belgium, Denmark, France, Germany, Ireland, the Netherlands, and Swedenas well asin the United Kingdom.As of 19 November,12pm, 302 HPAI A(H5) detections have been reported, with the majority of the detections referring to wild birds (n=281), and a few related to outbreaks in poultry (n=18) and captive birds (n=3). Most of the detections in wild birds were in wild waterbirds,being barnacle goose the most affected species (n=110), followed by greylag goose (n=47), Eurasian wigeon (n=32),mallard (n=14), and common buzzard (n=13).ThreeHPAI virus subtypes were identified, A(H5N8), A(H5N5) and A(H5N1), with A(H5N8) being the most reported subtype (n=284). Phylogenetic analysis indicated that the viruses evolved from a single progenitor virus thatwent through multiple reassortment events. Based on the ongoing autumn migration of wild waterbirds to their wintering areas in Europe, there is a continued risk of further introduction of HPAI A(H5) viruses into Europe. Furthermore, given the expected movements of both migratory, and resident wild birds in Europe during winter, there is a high risk of further spread of HPAI A(H5) viruses within Europe. No genetic markers indicating adaptation to mammals have been identified in the viruses analysed so far,andno human infection due to avian influenza viruses detected in the recent outbreakshas been reported. For that reason,the risk to the general population remains very low.However,following the precautionary principle, people should avoid touching sick or dead birds unprotected to minimise any potential risk.