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[1]
Department of Large Animal Medicine and Nutrition, Veterinary Faculty, State University of Utrech, Utrech, The Netherlands
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[2]
Department of Veterinary Microbiology and Parasitology, College of Veterinary Medicine, College Station, Texas, USA
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[3]
Department of Infectious Diseases and Immunology, Virology Division, Veterinary Faculty, State University of Utrech, Utrech, The Netherlands