Abstract
1 College of Veterinary Medicine, South China Agricultural University, 483 Wushan Street, Tianhe District, Guangzhou 510642, Guangdong Province, PR China
2 Laboratory of Epidemiology, Veterinary Institute, Academy of Military Medical Sciences, 1068 Qinglong Road, Changchun 130062, PR China
3 Institute of Veterinary Medicine, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong Province, PR China
4 Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510663, Guangdong Province, PR China
5 College of Agriculture, South China Agricultural University, 483 Wushan Street, Tianhe District, Guangzhou 510642, Guangdong Province, PR China