| Affiliation: | 1. Institut für Hygiene und Infektionskrankheiten der Tiere, Justus-Liebig-Universität Giessen, D-6300 Giessen, Frankfurter Str. 89, West Germany;2. Staatliche Veterinäruntersuchungsämter Frankfurt West Germany;3. Staatliche Veterinäruntersuchungsämter Giessen, West Germany;1. Department of Immunology, Pathophysiology and Veterinary Preventive Medicine, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland;2. Teagasc, Animal and Bioscience Research Department, Moorepark Research Centre, Fermoy, Ireland;3. Department of Internal Medicine and Clinic of Diseases of Horses, Dogs and Cats, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland;4. Department of Pathology, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland;5. Department of Virology, National Veterinary Research Institute, Pulawy, Poland;1. Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Cátedra de Inmunología, Av. Chorroarín 280, C1427CWO, Buenos Aires, Argentina;2. Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Av. Chorroarín 280, C1427CWO, Buenos Aires, Argentina;3. Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria Balcarce, Laboratorio de Bacteriología, Ruta 226, Km 73.5, Provincia de Buenos Aires, Balcarce B7620BEN, Argentina;4. Universidad Nacional de Mar del Plata, Facultad de Ciencias Agrarias, Departamento de Producción Animal, Mar del Plata, Ruta 226, Km 73.5, Provincia de Buenos Aires, Balcarce B7620BEN, Argentina;1. Department of Population Medicine, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G2W1, Canada;2. Veterinary Science and Policy, Ontario Ministry of Agriculture, Food and Rural Affairs, 6484 Wellington Rd 7, Unit 10, Elora, Ontario N0B 1S0, Canada |
