1. College of Veterinary MedicineSouth China Agricultural University Guangzhou 510642 Guangdong P. R. China
2. Key Laboratory of Zoonosis Prevention and Control of Guangdong Province Guangzhou 510642 Guangdong P. R. China
3. IRTACentre de Recerca en Sanitat Animal (CReSA, IRTA)Campus de la Universitat Autònoma de Barcelona Cerdanyola del Vallès 08193 Barcelona Spain
4. Universitat Autònoma de Barcelona Cerdanyola del Vallès 08193 Barcelona Spain
5. Infectious DiseasesDepartment of Animal MedicineFaculty of Veterinary MedicineZagazig University 44511 Zagazig Sharkia Province Egypt
6. College of AgricultureSouth China Agricultural University Guangzhou 510642 Guangdong P. R. China
7. Key Laboratory of Zoonosis of Ministry of Agriculture and Rural AffairsSouth China Agricultural University Guangzhou 510642 Guangdong P. R. China