Two Samaritan's Purse missionaries are to be evacuated in the coming days from Liberia to the United States for treatment of the highly contagious and deadly Ebola virus.

The missionaries are Americans, Dr. Kent Brantly and Nancy Writebol will be the first Ebola patients to enter U.S. territory, CNN reported Thursday.

One of the two patients will be brought to a special infectious disease and isolation unit at Atlanta's Emory University.

The facility was built in collaboration with the Center for Disease Control and Prevention. But there is no information on where the other patient will be treated.

According to Samaritan Purse, the condition of Nancy Writebol is worsening. But she is receiving an experimental drug that will hopefully improve her condition.

Writebol's husband, David, is with her but he had to wear protective clothing to protect himself from contracting the disease.

"She's weak, but she's working through it," Writebol's son, Jeremy told CNN.

Dr. Brantly received a transfusion of blood given by a 14-year-old boy who survived Ebola. Brantly had treated the teen and doctors hope that the boy's blood contains antibodies that can fight the deadly virus.

Brantly's wife and children left for Texas before he was diagnosed. With questions about the family's health, wife Amber said in a statement that she and her children "are physically fine."

"I remain hopeful and believing that Kent will be healed from this dreadful disease," Amber said. "He is strong and peaceful and confident in the love of Jesus Christ, which is his sustenance right now."

Liberian Information Minister Lewis Brown said that although Liberia cannot afford to lose health workers like Writebol and Brantly, they are with them in prayers and hope that the missionaries survive.

The World Health Organization reported that the Ebola virus infected 1,323 people in Guinea, Liberia, Sierra Leone and Nigeria between March and July 27. The symptoms can be a simple flu that can end in internal bleeding and death.