1. Division of Virology
2. Department of Veterinary Medicine and Public Health, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, K.B. Sarani, Calcutta 700037, India
3. Clinical Medicine, National Institute of Cholera & Enteric Diseases, Calcutta
4. ICMR Virus Unit, ID and BG Hospital Campus, Calcutta 700010
5. Department of Hygiene, Sapporo Medical University School of Medicine, Sapporo 060, Japan