Institution: | (1) Department of Microbiology, Faculty of Health Sciences, Medical College, The Aga Khan University, Stadium Road, Karachi 74800, Pakistan Fax: 92-21-4934294/4932095; E-mail: vzaman@akuc.edu, PK;(2) Department of Microbiology, Faculty of Medicine, National University of Singapore, Lower Kent Ridge Road, Singapore 0511, SG |