Institution: | 1. Parasitology Laboratory, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, PO Box 369 Sentrum, 0102 Oslo, Norway;2. Section of Epidemiology, Vetsuisse Faculty, University of Zürich, Winterthurerstrasse 270, 8057 Zürich, Switzerland;3. Centre for Zoonoses and Environmental Microbiology, National institute for Public Health and the Environment (RIVM), PO Box 9, 3520 BA Bilthoven, The Netherlands |