1. Department of Microbiology and Infectious Diseases; School of Health Sciences; Aristotle University of Thessaloniki; 54124 Greece
2. Laboratory of Anatomy Histology, and Embryology; School of Health Sciences; Aristotle University of Thessaloniki; 54124 Greece
3. Department of Botany; School of Biology; Aristotle University of Thessaloniki; 54124 Greece
4. Department of Pathology; Faculty of Veterinary Medicine; School of Health Sciences; Aristotle University of Thessaloniki; 54124 Greece
5. Laboratory of Virology; Faculty of Veterinary Medicine; Ghent University; 9820 Merelbeke Belgium