Funding for this research was provided by:
International Cooperation and Exchange Programme (No. 31520103917)
Received: 4 February 2020
Accepted: 2 July 2020
First Online: 6 July 2020
Ethics approval and consent to participate
: This article does not contain any studies with human participants. Piglets used for infection experiments were performed in strict accordance with the Regulations for the Administration of Affairs Concerning Experimental Animals approved by the State Council of the People’s Republic of China (1988.11.1). The protocol was also reviewed by the Institutional Animal Care and the Committee of Jilin University and was in compliance with the Jilin Laboratory Animal Welfare and Ethics guidelines.
: Not applicable.
: The authors declare that they have no direct or indirect conflict of interest. All the authors listed have approved the present submitted version.