ATLANTA — The husband of the second American aid worker recently diagnosed with Ebola says the patient is weak but showing signs of improvement.

The president of the aid group SIM USA said Tuesday that Nancy Writebol’s husband described the woman as progressing. Bruce Johnson says he spoke with David Writebol, who said 59-year-old Nancy stood and got on a plane in Liberia with assistance to head to Atlanta for treatment. When she arrived Tuesday, she was wheeled in a stretcher.