1. Division of Virology, ICMR-National institute of Cholera and Enteric Diseases, Kolkata, India;
2. Division of Virus Research and Diagnostic Laboratory, ICMR-National institute of Cholera and Enteric Diseases, Kolkata, India;
3. Division of Bacteriology, ICMR-National institute of Cholera and Enteric Diseases, Kolkata, India