1. Department of Medical Microbiology and Immunology, School of Medicine, University of California Davis, Davis, CA, USA.
2. College of Veterinary Medicine, China Agricultural University, Beijing 100193, China.
3. School of Veterinary Medicine, University of California Davis, Davis, CA, USA.
4. Institute for Molecular Infection Biology (IMIB), Faculty of Medicine, University of Würzburg, D-97080 Würzburg, Germany.
5. Mouse Biology Program, University of California Davis, Davis, CA, USA.
6. Department of Pathobiology, School of Veterinary Medicine, St. George’s University, Grenada, West Indies.