US Lab Error Raises Ebola Exposure Concern As Infection Hits Fourth UN Worker In Liberia

Health officials at the U.S. Centers For Disease Control and Prevention in Atlanta (CDC) are monitoring a technician who inadvertently handled a live Ebola virus sample. The incident, which occurred Monday and was confirmed by federal officials on Wednesday, is the latest in a number of flubs placing the country's top infectious disease control agency under scrutiny.