BOONE, N.C. (AP) — A relief group official says two American aid workers have tested positive for the Ebola virus while working to combat an outbreak of the deadly disease at a hospital in Liberia.

Ken Isaacs, a vice president of Samaritan's Purse, says told The Associated Press on Sunday that Dr. Kent Brantly was stable and in very serious condition. Thirty-three-year-old Brantly is the medical director for the group's Ebola care center on the outskirts of the Liberian capital of Monrovia.

Isaacs identified the second American, Nancy Writebol, as a worker with an allied aid group SIM, or Serving in Mission, which runs the hospital. He said she was in stable and serious condition.

He said both Americans have since been isolated and are under intensive treatment.

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