She began a course of an experimental drug, ZMapp, while still in Liberia, and completed it at Emory. She received a blood transfusion in Liberia and platelets at Emory, but not from an Ebola survivor. “There was no match for me,” she said.

She said that when she got the call to donate plasma, she was not told who the intended recipient was, but she guessed that it was Dr. Spencer. His status as the first New Yorker to come down with Ebola — as well as his energetic travels around the city by subway and Uber cab in the previous days — had made him the focus of intense attention.

She donated at a doctor’s office in Charlotte. As she was connected to the machine that removed her plasma, she thought of her faith. “The thing it made me think about was the blood of Christ,” she said. “That there is life in blood.”

She said that Dr. Spencer’s parents had expressed their gratitude by email, but that she had not communicated directly with him.