1. Postgraduate Study of Faculty of Veterinary Medicine, Airlangga University, Surabaya, Indonesia.
2. Department of Veterinary Public Health, Faculty of Veterinary Medicine, Airlangga University, Surabaya, Indonesia.
3. Department of Microbiology, Faculty of Veterinary Medicine, Wijaya Kusuma University, Surabaya, Indonesia.
4. Department of Veterinary Public Health, Faculty of Veterinary Medicine, Wijaya Kusuma University, Surabaya, Indonesia.