Understanding pneumonic plague after Russian lab worker's death

Filed by Dirk Danger

The U.S. is closely monitoring a potential case of pneumonic plague in Russia after a laboratory worker who studied the disease fell ill and died. Russian authorities insist there is no cause for alarm, but officials have imposed quarantines and other measures at several medical facilities in Siberia. Geoff Bennett discussed more with Annie Jacobsen, author of "Biological War: A Scenario."