1. College of Natural Sciences, Department of Microbial, Cellular and Molecular Biology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
2. Department of Biology, Debre Berhan University, P.O. Box 445, Debre Berhan, Ethiopia
3. Armauer Hansen Research Institute, Addis Ababa, Ethiopia
4. St. Paul’s Hospital Millennium Medical College and Addis Ababa University, Addis Ababa, Ethiopia
5. School of Medicine, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia