1. Division of Microbiology, National Institute of Cholera & Enteric Diseases, (Indian Council of Medical Research), P- 33, Scheme-XM, CIT Road, Beliaghata, Kolkata 700 010, India
2. Division of Bacteriology, National Institute of Cholera & Enteric Diseases, P- 33, Scheme-XM, CIT Road, Beliaghata, Kolkata 700 010, India
3. Division of Epidemiology, National Institute of Cholera & Enteric Diseases, (Indian Council of Medical Research), P- 33, Scheme-XM, CIT Road, Beliaghata, Kolkata 700 010, India