Emergence of H3N8 avian influenza viruses possessing tri-basic hemagglutinin cleavage sites in China

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1. National Natural Science Foun-dation of China [32002320]
2. Natural Science Foundation of Guangdong Province, China [2020A1515010116, 2022A1515012462]
3. Medical Scientific Research Foundation of Guangdong Province, China [A2020083]
4. National Natural Science Foundation of China [31960688]
5. Postgradu-ate exploration fund of Foshan University [2021ZYTS24]