Editor's Note: Anderson Cooper's full interview with Nancy Writebol and her husband David airs tonight on a special two hour AC360 starting at 8pm ET.
Nancy Writebol says she really doesn't know how she was infected with Ebola. She was doing missionary work in Liberia when she fell ill. In her interview with Anderson, Writebol describes the moment that she learned about the Ebola diagnosis and her feelings when she realized that her husband could not put his arms around her.
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