1. Department of Obstetrics and Reproduction; University of Thessaly; PO Box 199 GR-43100 Karditsa Greece
2. Laboratory of Microbiology and Parasitology; University of Thessaly; PO Box 199 GR-43100 Karditsa Greece
3. Laboratory of Pathology, Faculty of Veterinary Medicine; University of Thessaly; PO Box 199 GR-43100 Karditsa Greece
4. Laboratory of Pathology, Faculty of Veterinary Medicine; Aristotle University; GR-54006 Thessaloniki Greece