1. Department of Microbiology, Faculty of Medicine, Health Sciences Center, Kuwait University, P.O. Box 24923, 13110 Safat, Kuwait
2. Department of Microbiology, Al-Amiri Hospital, Ministry of Health, P.O. Box 4077, Safat 13041, Kuwait
3. Department of Medicine, Al-Amiri Hospital, Ministry of Health, P.O. Box 4077, Safat 13041, Kuwait