1. Institute of Parasitology; Faculty of Veterinary Medicine; Centre for Infectious Diseases; University Leipzig; An den Tierkliniken 35 04103 Leipzig Germany
2. Avian and Rabbits Diseases Department; Faculty of Veterinary Medicine; Sadat City University Egypt
3. Institute for Bacteriology and Mycology; Faculty of Veterinary Medicine; Centre for Infectious Diseases; University Leipzig; An den Tierkliniken 29 04103 Leipzig Germany