1. Department of Pharmaceutical Microbiology, International University of Africa, Khartoum, Sudan
2. Department of Pharmaceutics, Faculty of Pharmacy, University of Khartoum, Khartoum, Sudan
3. Department of Microbiology, College of Medicine, Umm Al Qura University, Makkah, Saudi Arabia
4. Department of Microbiology, Faculty of Medical Laboratory Sciences, Sudan University of Sciences and Technology, Khartoum, Sudan