1. Department of Microbiology, Vestfold Hospital Trust , PO Box 2168, 3103 Tønsberg , Norway
2. Department of Internal Medicine, Yekatit 12 Hospital Medical College , Weatherall St, Addis Ababa , Ethiopia
3. Education Development Center Department, Yekatit 12 Hospital Medical College , Weatherall St, Addis Ababa , Ethiopia
4. Department of Microbiology, Yekatit 12 Hospital Medical College , Weatherall St, Addis Ababa , Ethiopia
5. Armauer Hansen Research Institute , Addis Ababa , Ethiopia