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Emerg Infect Dis . Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus and Mass Mortality in Eurasian Cranes, Germany, 2025

tetano

tetano

Editor, Senior Moderator
Emerg Infect Dis


. 2026 May;32(5):779-783.
doi: 10.3201/eid3205.260170.
Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus and Mass Mortality in Eurasian Cranes, Germany, 2025

Anne Günther, Christof Herrmann, Julia Sehl-Ewert, Simon Piro, Ann Kathrin Ahrens, Sten Calvelage, Anne Pohlmann, Martin Beer, Timm Harder
Abstract

In autumn 2025, highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus, genotype EA-2024-DI.2.1, caused systemic infections leading to a mass mortality event among the western migrating subpopulation of Eurasian cranes (Grus grus) in Germany. Gregarious behavior at feeding and resting sites likely promoted rapid viral spread within the population.

Keywords: Eurasian crane; Germany; H5; HPAI; clade 2.3.4.4b; highly pathogenic avian influenza; influenza; migration; passive surveillance; respiratory infections; transmission; viruses; zoonoses.

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