Highly Pathogenic Avian Influenza A (H5N1) Clade 2.3.2.1a virus infection in domestic cats, India, 2025
Raut, A. A.; Aasdev, A.; Kumar, N.; Pathak, A.; Mishra, A.; Sehgal, P.; Pateriya, A.; Pandey, M. K.; Bhatia, S.; Mishra, A.
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In January 2025, the highly pathogenic avian influenza A(H5N1) virus clade 2.3.2.1a infection was detected in domestic cats and whole-genome sequencing of two cat H5N1 isolates was performed using the Oxford Nanopore MinION sequencing platform. Phylogenetic analysis revealed the circulation of triple reassortant viruses in cats. Although cat viruses lacked classic mammalian adaptation markers they carried mutations associated with enhanced polymerase activity in mammalian cells and increased affinity for 2-6 sialic acid receptor suggesting their potential role in facilitating infection in cats. The identification of reassortant HPAI H5N1 clade 2.3.2.1a viruses in domestic cats in India highlights the urgent need for enhanced surveillance in domestic poultry, wild birds, and mammals, including humans, to track genomic diversity and molecular evolution of circulating strains.
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