1. Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain
2. Culture Collection, Department of Clinical Bacteriology, University of Göteborg, Guldhedsgatan 10, SE-413 46 Göteborg, Sweden
3. Departmento de Medicina y Cirugía, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain
4. School of Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AP, United Kingdom