Dr. Kent Brantly contracted the often-deadly Ebola virus while responding to a historic outbreak in West Africa.

Two American aid workers discharged from an Atlanta hospital after being treated for Ebola pose no health risk to the public, an Emory University Hospital doctor said on Thursday.

Dr. Kent Brantly and missionary Nancy Writebol, who both contracted the deadly virus in Liberia, have tested clear of the virus and are likely to make a complete recovery, said Dr. Bruce Ribner, medical director of Emory's Infectious Disease Unit.

"I am forever thankful to God for sparing my life," Brantly said during a news conference Thursday morning that marked his first public appearance since walking into the hospital wearing a bio-hazard suit on Aug. 2.

Brantly and Writebol were given ZMapp, a drug used on a handful of patients in the West African outbreak and produced by U.S.-based Mapp Biopharmaceutical.

Writebol 59, of Charlotte, North Carolina, was discharged from Emory University Hospital Tuesday, Ribner said at the news conference. Writebol had requested the hospital keep news of her release private. 

"As she walked out of her isolation room, all she could say was, 'To God be the glory,'" Brantly, himself a physician who was working for the Christian relief group Samaritan's Purse, told reporters in Atlanta.

Brantly, who was set to leave the hospital after speaking at the news conference, has requested privacy and plans to speak to the media at a later date.

The World Health Organization said on Wednesday that 2,473 people have been infected and 1,350 have died since the Ebola outbreak was identified in remote southeastern Guinea in March.

It said that no cases of the disease had been confirmed outside of Guinea, Sierra Leone,Liberia and Nigeria despite cases having been suspected elsewhere.

A senior health official in Togo said on Thursday that two suspected cases, including a sailor from the Philippines, were being tested for the virus.

Three African doctors, also treated with ZMapp in Liberia, have shown remarkable signs of improvement, Liberian Information Minister Lewis Brown told Reuters on Tuesday.

Mapp says its supplies of the drug have been exhausted.

Reuters contributed