Detection of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus in cull dairy cows with underlying respiratory and systemic disease

Daniel J. Righter, Erin B. Howey, Chris L. Siepker, Eric R. Burrough, Drew R. Magstadt, Marta Mainenti, Asha Fears, Aaron D. Lehmkuhl, Gleeson Murphy, Kimberly Lehman, Mia Kim Torchetti, Suelee Robbe-Austerman, Carrie E. Schmidt

Journal of Veterinary Diagnostic Investigation

Published online on February 13, 2026

Abstract

Journal of Veterinary Diagnostic Investigation, Ahead of Print.
Highly pathogenic avian influenza (HPAI) A(H5N1) clade 2.3.4.4b virus was identified in 4 cull dairy cows condemned by the U.S. Department of Agriculture because of pneumonia with accompanying systemic changes. Histologic findings were bronchopneumonia in ...