Comparison of Gross Lesions in Poultry Naturally Infected With High Pathogenicity Avian Influenza H5N6 and H5N1 Viruses in South Korea, 2023-2025.

ABSTRACT: High pathogenicity avian influenza (HPAI) is an acute infectious disease of poultry and wild birds that has been occurring worldwide and has been controlled in many countries by culling birds on farms with disease outbreaks. We compared the gross lesions observed in influenza A (H5Nx) virus-positive cases of chickens and ducks in South Korea between 2023 and 2025. A total of 49 outbreaks were identified, comprising 34 cases in chickens and 15 cases in ducks, with both H5N1 and H5N6 subtypes detected. The lesions observed most frequently in chickens included splenomegaly and splenic necrosis, followed by tracheal congestion and pancreatic necrosis. In ducks, tracheal congestion was the most common lesion, followed by pancreatic necrosis and splenomegaly; hemorrhage and/or necrosis were also

SUBMITTER: Kim HR 

PROVIDER: S-EPMC12672067 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature