Ebola virus patient Dr. Spencer Craig is looking better, but remains in serious but stable condition, according to a hospital official.

In a written statement released Sunday afternoon at Bellevue Hospital Center, where Spencer, 33, has been since Thursday when he was brought from his West Harlem apartment, Dr. Ram Raju, president of New York City Health and Hospitals Corporation, said: "The patient looks better than he looked yesterday."

He said that Spencer, who returned to New York from Guinea where he had been volunteering with Doctors Without Borders, "remains in serious but stable condition."

Raju said that he had talked with Spencer and the doctors and nurses treating him.

"He tolerated the plasma treatment well and had a good night sleep," Raju said in reference to blood plasma Spencer has reportedly received from Nancy Writebol, an American nurse who survived Ebola.

"From his first day here, he expressed gratitude with the care he is receiving under the watchful eye of the dedicated, well-trained and professional team of ICU physicians and nurses who are exclusively assigned to his care," Raju said.