1. Department of Microbiology, IIMSAR & BCRH, Haldia, West Bengal, India
2. Department of Microbiology, Medical College Kolkata, 88 College Street, Kolkata, West Bengal, India
3. ICMR Virus Unit, I.D. and B.G. Hospital, GB-4, 1st Floor, 57 Dr. S. C. Banerjee Road, Beliaghata, Kolkata, India
4. Department of Medicine, Medical College Kolkata, 88 College Street, Kolkata, West Bengal, India
5. Department of Community Medicine, A.I.I.H. & P.H., Kolkata, West Bengal, India