1. Department of Microbiology; Veterinary Faculty; University of Istanbul; Avcilar Istanbul Turkey
2. Department of Obstetrics and Gynaecology; Veterinary Faculty; University of Istanbul; Avcilar Istanbul Turkey
3. Department of Virology; Veterinary Faculty; University of Istanbul; Avcilar Istanbul Turkey
4. Epizootic Research Center; Equine Research Institute; The Japan Racing Association; 1400-4 Shiba, Kokubunjimachi Shimotsuga-gun Tochigi 329-0412 Japan
5. Nippon Institute for Biological Science; 9-2221-1 Shinmachi, Ome Tokyo 198-0024 Japan