"Experimental Serum" To Be Used On American Woman Fighting Ebola

Both Writebol and Dr. Kent Brantly, who are members of Samaritan's Purse involved in treating Ebola victims in Liberia, contracted the virus and are currently in a "stable but grave condition," with Brantly taking a slight turn for the worse overnight, the organization said.

"Yesterday, an experimental serum arrived in the country, but there was only enough for one person. Dr. Brantly asked that it be given to Nancy Writebol," said Franklin Graham, president of Samaritan’s Purse in the statement. "However, Dr. Brantly received a unit of blood from a 14-year-old boy who had survived Ebola because of Dr. Brantly’s care. The young boy and his family wanted to be able to help the doctor that saved his life."

Nancy Writebol, an American hygienist employed by Serving in Mission (SIM), is in isolation at Samaritan’s Purse care center in Monrovia, Liberia.

Writebol and her husband, David, are missionaries who have been working in the region for decades, according to Today. They have been living in Monrovia since August 2013, CNN reported.

Nancy was part of a joint SIM and Samaritan's Purse team treating Ebola victims in Monrovia. She was involved in decontaminating medical workers who had direct contact with people fighting the Ebola virus.

Jeremy said his mother was helping the doctors and medical staff contain the deadly virus and "serving them as best she could."

There were concerns that Nancy's husband, David, who was in close contact with her before she went into isolation, may have contracted the virus. But Jeremy said his father has been checking his temperature every six hours, and is "strong and healthy right now."

Both Writebol and Brantly "remain in serious condition," according to a statement issued Wednesday by Samaritan's Purse.

More than 300 Peace Corps workers will temporarily leave Liberia, Sierra Leone, and Guinea, which have been most affected by the deadly virus, CNN reported. Samaritan's Purse is planning to remove all nonessential workers from Liberia, the Associated Press reported.

The disease — which has no cure — has killed at least 672 people, according to the World Health Organization. Around 800 to 1,200 cases of Ebola have been detected in the region.