Summary
The H3 subtype of avian influenza virus (AIV) stands out as one of the most prevalent subtypes, posing a significant threat to public health. In this study, a novel triple-reassortant H3N3 AIV designated A/chicken/China/16/2023 (H3N3), was isolated from a sick chicken in northern China. The complete genome of the isolate was determined using next-generation sequencing, and the AIV-like particles were confirmed via transmission electron microscopy. Subsequent phylogenetic analyses revealed that HA and NA genes of the H3N3 isolate clustered within the Eurasian lineage of AIVs, exhibiting the closest genetic relationship with other H3N3 AIVs identified in China during 2023. Interestingly, the HA and NA genes of the nove H3N3 isolate were originated from H3N8 and H10N3 AIVs, respectively, and
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