Affiliation: | 1. Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, New York, USA;2. Institut für Virologie, Freie Universit?t Berlin, Berlin, Germany.;3. Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, New York, USA;4. Department of Molecular Medicine, College of Veterinary Medicine, Cornell University, New York, USA |