Since it was first described by international health organizations in 2006, extensively drug-resistant tuberculosis has been documented in 49 countries. In addition, more than 80 countries are coping with multi-drug resistant tuberculosis. How are we addressing the rapid emergence of these significant threats to tuberculosis treatment and control programs across the world? In which countries are we seeing significant progress in treating both forms of tuberculosis? Dr. Sonya Shin, assistant professor of medicine at Harvard Medical School, contours lessons for the global struggle against TB from her work in South America and Asia with host Dr. Mark Nolan Hill.