1. State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou, Gansu 730046, PR China
2. Guangdong Province Key Laboratory Microbial Signals and Disease Co, and Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, Guangdong 510642, PR China