Amber Vinson in a photograph taken earlier this week at Emory University Hospital in Atlanta. Officials at Emory and the Centers for Disease Control and Prevention couldn't detect Ebola in Amber Vinson as of Tuesday evening, her family said in a statement. AP hide caption

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Thomas Eric Duncan, the first Ebola patient diagnosed in the U.S., at a wedding in Ghana. Texas Health Presbyterian Hospital Dallas, where Duncan was being treated for the disease, on Wednesday, Oct. 8, 2014 said Duncan has died. Wilmot Chayee/AP hide caption

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Police stand guard outside the apartment of a hospital worker who has tested positive for Ebola in Dallas Sunday. In the background is a yellow barrel used to dispose of hazardous materials. Roger Steinman/AP hide caption

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Thomas Eric Duncan died at Texas Health Presbyterian Hospital in Dallas Wednesday morning. He is the first person to have been diagnosed with Ebola in the United States. LM Otero/AP hide caption

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Dallas County Judge Clay Jenkins, right, escorts people who were at the apartment unit where Thomas Eric Duncan, a Liberian citizen diagnosed with the Ebola virus, had been staying. Jenkins used his car to drive the people to a new place to stay in Dallas. JIM YOUNG/Reuters /Landov hide caption

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A man diagnosed with the Ebola virus this week is being treated at Texas Health Presbyterian Hospital in Dallas. The patient recently traveled to Dallas from Liberia. Mike Stone/Getty Images hide caption

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