Genetic and Pathogenicity Studies of Avian Influenza (H9N2) Virus Isolated from Chickens in Jiangsu Province, China, in 2025
In this study, one H9N2 subtype avian influenza virus (AIV) was isolated in Jiangsu Province, China, in March 2025. According to phylogenetic analysis, the HA gene fragment of the H9N2 isolate was classified as the B4.7 lineage, with the remaining seven segments falling into the Eurasian lineage. This H9N2 virus underw...