1. Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, 4 Stigbøjlen, DK-1870 Frederiksberg C, Denmark
2. Department of Clinical Microbiology, Aarhus University Hospital Skejby, Denmark
3. GD, Postbus 9, 7400 AA Deventer, The Netherlands
4. Clinic for Avian, Reptile and Fish Medicine, Department for Farm Animals and Veterinary Public Health, University for Veterinary Medicine Vienna (Vetmeduni Vienna), Veterinaerplatz 1, 1210 Vienna, Austria