1. Division of Biological Standardization, Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh 243122, India
2. Division of Pathology, Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh 243122, India
3. Quality Operations Laboratory, University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
4. National Institute of Cholera and Enteric Diseases, P-33, C.I.T. Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700 010, India
5. Department of Hygiene, Sapporo Medical University School of Medicine, S-1 W-17, Chuo-Ku, Sapporo 060-8556, Japan
6. Veterinary Medical Research Institute, Hungarian Academy of Sciences, Hungária Krt. 21, Budapest H-1 143, Hungary