The two American aid workers who were infected with the deadly Ebola virus in Africa have been discharged from an Atlanta hospital where they were treated, AP cited the aid groups they were working for as saying Thursday. Alison Geist, a spokeswoman for Samaritan's Purse, told The Associated Press she did not know the exact time Dr. Kent Brantly would be released from Emory University Hospital but confirmed it would happen Thursday. The group SIM says Nancy Writebol was discharged from Emory on Tuesday. Her husband, David, said in a statement that she is free of the virus but has been left in a significantly weakened condition and decided it would be best to leave the hospital privately and head off to rest and recuperate at an undisclosed location. Emory planned to hold a news conference Thursday morning to discuss both patients' discharge. Franklin Graham, president of North Carolina-based Samaritan's Purse, said in a statement that the group was celebrating Brantly's recovery. He has been in the hospital's isolation unit for nearly three weeks. Brantly, 33, was flown out of the west African nation of Liberia on Aug. 2, and Nancy Writebol, 59, followed Aug. 5. The two were infected while working at a missionary clinic outside Liberia's capital. The Ebola outbreak has killed more than 1,300 people across West Africa.