1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, P. R. China
2. Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, P. R. China
3. Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, P. R. China
4. Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou 510642, P. R. China
5. National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou 510642, P. R. China