1. Centre for Zoo and Wild Animal Health, Copenhagen Zoo, Roskildevej 38, Frederiksberg C, Denmark
2. Zoophysiology, Department of Biological Sciences, University of Aarhus, Aarhus C, Denmark
3. Danish Centre for Experimental Parasitology, Faculty of Life Sciences, University of Copenhagen, Dyrlægevej 100, Frederiksberg C, Denmark
4. Institute of Physiology and Biophysics, University of Aarhus, Aarhus C, Denmark
5. Department of Pathology, Vendsyssel Hospital, Hjørring, Denmark