Funding for this research was provided by:
Japan Society for the Promotion of Science (JPH04639)
Received: 20 August 2020
Accepted: 15 June 2021
First Online: 5 July 2021
: Serum samples were collected from commercial pig farms and were not aggressively operated for sample collection. The permission for sample collection from farm owners has already obtained according to their request to check PEDV infection. Animal Ethics Committee of Vietnam National University of Agriculture (approval no. VNUA-2020.05) approved this experiment procedure.
: Not applicable.
: The authors declare that they have no competing interests.