The medical plane carrying missionary Nancy Writebol touched down at Dobbin Air Reserve base in Marietta, Georgia, just before noon. It was the end of a long flight from Liberia. Ill with the deadly Ebola virus, Writebol was taken to Emory University Hospital, where she'll get further treatment in a special isolation ward. Ebola has killed nearly 900 people since February. It has no proven cure. Writebol's arrival comes days after U.S. doctor Kent Brantly returned home.