Another American Ebola Patient Arrives in Atlanta

The patient is the fourth American to contract the virus in West Africa.

The patient was evacuated from Sierra Leone via air ambulance to receive treatment where two other American Ebola survivors –- Dr. Kent Brantly and missionary Nancy Writebol -– received supportive care and were later declared virus-free. Writebol was discharged Aug. 19 and Brantly went home two days later.

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ABC News' Dr. Richard Besser contributed to this story.