Public health experts investigate death of Siberian lab worker from possible plague

A young woman who worked at a plague research institute in Siberia has died, fueling concerns of a lab leak. Local authorities are monitoring other workers in the area. But much of what happened is unknown, and the reports coming out of Siberia are conflicting. The World's Host Carolyn Beeler speaks with Nahid Bhadelia, director of Boston University's Center on Emerging Infectious Diseases, to clear up what we know and what we don't.