Affiliation: | 1. Area of Parasitology, Department of Animal Health, Veterinary Faculty, University of Extremadura, Cáceres, Spain;2. United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Beltsville, MD, USA;3. Parasitology Service, Microbiology National Centre, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain |