1. Department of Virology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India.
2. Department of Epidemiology, and ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India.
3. Department of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India.