1. World Health Organization: WHO Report 2011. Global tuberculosis control 2011. 2011, Geneva: World Health Organization
2. Jain A, Mondal R: Extensively drug-resistant tuberculosis: current challenges and threats. FEMS Immunol Med Microbiol. 2008, 53: 145-150. 10.1111/j.1574-695X.2008.00400.x.
3. World Health Organization, IUATLD: Anti-tuberculosis drug resistance in the world. Fourth global report. WHO/HTM/TB/2008.394. 2008, Geneva: World Health Organization
4. Sudre P, ten Dam G, Kochi A: Tuberculosis: a global overview of the situation today. Bull World Health Organ. 1992, 70: 149-159.
5. Asmamaw D, Seyoum B, Makonnen E, Atsebeha H, Woldemeskel D, Yamuah L, Addus H, Aseffa A: Primary drug resistance in newly diagnosed smear positive tuberculosis patients in Addis Ababa, Ethiopia. Ethiop Med J. 2008, 46: 367-374.