1. College of Plant Sciences, Jilin University; Changchun 130062 China
2. Department of Microbial Pathogenesis and Immunology; Texas A&M Health Science Center; College Station TX 77843 USA
3. Norman Borlaug Center, Texas A&M University; College Station TX 77843 USA
4. Department of Veterinary Pathobiology; College of Veterinary Medicine, Texas A&M University; College Station TX 77843 USA
5. Key Laboratory of Zoonosis Research, Ministry of Education; Jilin University; Changchun 130062 China