1. Laboratory of Food Microbiology and Hygiene, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Japan
2. Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
3. Collaborative Research Center of Okayama University for Infectious Diseases in India, Okayama University, Kolkata, West Bengal, India