Affiliation: | 1. Virus and Prion Diseases of Livestock Research Unit, USDA, ARS, National Animal Disease Center , Ames, Iowa, USA jneill@nadc.ars.usda.gov;3. Virus and Prion Diseases of Livestock Research Unit, USDA, ARS, National Animal Disease Center , Ames, Iowa, USA;4. Friedrich-Loeffler Institute, Federal Research Institute for Animal Health , Jena, Germany |