1. Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, USA
2. Center for Vaccines and Immunology, University of Georgia, Athens, GA, USA
3. United States Department of Agriculture, Agricultural Research Service, National Animal Disease Center, Ames, IA, USA
4. Department of Biology, Lycoming College, Williamsport, PA, USA
5. Division of Comparative Medicine, Washington University, St. Louis, MO, USA
6. Lee Kong Chian School of Medicine and Singapore Centre on Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
7. J. Craig Venter Institute, Rockville, MD, USA