Sarman Singh1, Mani M Sankar2. 1. Division of Clinical Microbiology and Molecular Medicine, Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi, 110029, India. Electronic address: sarman_singh@yahoo.com. 2. Division of Clinical Microbiology and Molecular Medicine, Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi, 110029, India.