1. 1 Department of Microbiology, Faculty of Medical Laboratory Sciences, University of El-Imam El-Mahdi, Kosti, Sudan
2. 2 Department of Medical Microbiology, Faculty of Medical Laboratory Sciences, University of Khartoum, Khartoum, Sudan
3. 3 Department of Surgery, Faculty of Medicine, University of El-Imam El-Mahdi, Kosti, Sudan
4. 4 Department of Biochemistry, Faculty of Medicine, University of El-Imam El-Mahdi, Kosti, Sudan