Wafa Ibrahim Elhag ***3, Nafisa Osman Mohammed*1, Nafisa Ahmed Ibrahim **2,, *1- Microbiology department, Faculty of Medical Laboratory Sciences, Al Neelain University, Sudan. **2- lecturer, Microbiology department, Faculty of Medical Laboratory Sciences, Al Neelain University, Sudan. ***3- Associate professor, Microbiology department, Faculty of Medical Laboratory Sciences, Al Neelain University, Sudan., Sudan