Funding for this research was provided by:
National Natural Science Foundation of China (31772755)
Special Financial Grant from the China Postdoctoral Science Foundation (2017T100410)
the Earmarked Fund For China Agriculture Research System (CARS-40)
the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Received: 19 February 2020
Accepted: 2 February 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: No animal was involved in the experiments. All experiments involving live virulent H7N9 viruses were housed in negativepressure isolators with HEPA filters in animal biosecurity level-3 facilities in accordance with the institutional bio-safety manual.
: Not applicable.
: The authors declare that they have no competing interests.