One third of the world’s population is infected with tuberculosis. That means every time you take a subway, taxi or board a plane, chances are you’re coming into contact with TB. While the number of tuberculosis cases reported in the U.S. is on the decline, in less developed countries the disease never went away and is getting worse. A new study finds that 1 million of the 8 million new infections each year are in children -– twice as many as previously thought. And worse yet, more than 30,000 of those children have drug-resistant strains of TB. Diane and her guests discuss the global health challenge of treating tuberculosis.