1. Sustainable Swine Research Center, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan.
2. Animal Disease Diagnostic Center, College of Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan.
3. Department of Veterinary Medicine, College of Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan.
4. Schweitzer Biotech Company Ltd., Taipei 11493, Taiwan.