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Nancy Writebol, an American aid worker from North Carolina who was infected with the Ebola virus while working in Liberia, arrives at Emory University Hospital in Atlanta, Tuesday, Aug. 5, 2014. Writebol is expected to be admitted to the hospital, where she will join another U.S. aid worker, Dr. Kent Brantly, in a special isolation unit. (AP Photo/(AP Photo/The Atlanta Journal & Constitution, John Spink/AJC/AP
Nancy Writebol, an American aid worker from North Carolina who was infected with the Ebola virus while working in Liberia, arrives at Emory University Hospital in Atlanta, Tuesday, Aug. 5, 2014. Writebol is expected to be admitted to the hospital, where she will join another U.S. aid worker, Dr. Kent Brantly, in a special isolation unit. (AP Photo/(AP Photo/The Atlanta Journal & Constitution, John Spink/AJC/AP

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    Second American Ebola patient in U.S.

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Second American Ebola patient in U.S.

American woman infected with Ebola arrives in U.S. CNN's Dr. Sanjay Gupta reports.

Second American Ebola patient in U.S.

American woman infected with Ebola arrives in U.S. CNN's Dr. Sanjay Gupta reports.