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The workers donned hazmat suits, trying to protect themselves from exposure.

.@MaxDPD :@DallasFireRes_q hazmat suiting up to decon apartment of 2nd health care worker with Ebola #DallasEbola pic.twitter.com/Y2nM2q6GWx

— Dallas Police Depart (@DallasPD) October 15, 2014

The new diagnosis comes days after nurse Nina Pham, 26, who also treated Duncan, was diagnosed with Ebola. Duncan was diagnosed with Ebola Sept. 30 and died Oct. 8.

Burwell admitted that the reasons for the hospital workers becoming infected aren't clear.

\"Those are people that came in contact because we don't understand exactly how the breach in protocol occurred,\" Burwell told ABC News today. \"We are taking the precaution of making sure that anyone within that treatment phase will be tracked and monitored in a more serious way.\"

Ebola has killed more than 4,000 people, mostly in the West African countries of Liberia, Sierra Leone and Guinea, according to recent figures by the World Health Organization.

Get real-time updates as this story unfolds. To start, just \"star\" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here.

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