Acknowledgments
Nguyen Manh Tuong was granted by an Asean scholarship from Chulalongkorn
University. Chutchai Piewbang was granted by the Ratchadaphisek Somphot
Fund for Postdoctoral Fellowship, Chulalongkorn University. This study
was supported by the 90th Anniversary of Chulalongkorn
University Fund (Ratchadaphiseksomphot Endowment Fund) and Veterinary
Pathogen Bank, Faculty of Veterinary Science, Chulalongkorn University.