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DALLAS, TX - OCTOBER 12: G.C. Williford, Battalion Chief for the Dallas Fire Department, walks past a barrel containing waste material that was removed from the apartment where a second person has been diagnosed with the Ebola virus on October 12, 2014 in Dallas, Texas. A female nurse working at Texas Heath Presbyterian Hospital, the same facility that treated Thomas Eric Duncan, has tested positive for the virus. (Photo by Mike Stone/Getty Images)
DALLAS, TX - OCTOBER 12: G.C. Williford, Battalion Chief for the Dallas Fire Department, walks past a barrel containing waste material that was removed from the apartment where a second person has been diagnosed with the Ebola virus on October 12, 2014 in Dallas, Texas. A female nurse working at Texas Heath Presbyterian Hospital, the same facility that treated Thomas Eric Duncan, has tested positive for the virus. (Photo by Mike Stone/Getty Images)

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CDC: Protocol 'breach' led to infection

Health officials are investigating how a U.S. nurse contracted Ebola despite wearing protective garments.

CDC: Protocol 'breach' led to infection

Health officials are investigating how a U.S. nurse contracted Ebola despite wearing protective garments.