1. Robert Koch-Institute, FG16: Mycotic and Parasitic Agents and Mycobacteria, Berlin, Germany
2. Immunology Unit and Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine, Hannover, Germany
3. Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Epidemiology, National Reference Centre for Toxoplasmosis, Greifswald-Insel Riems, Germany
4. United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Beltsville, Maryland, USA
5. Department of Infectious Diseases, Istituto Superiore di Sanità, Rome, Italy