OMAHA, Neb. (AP) — An American aid worker infected with Ebola has been given blood from a fellow doctor who battled the disease, and Nebraska doctors say the man has responded well to aggressive treatment in the past week.

Doctors say Dr. Rick Sacra received two blood transfusions from Dr. Kent Brantly last weekend after arriving at the Nebraska Medical Center. Sacra has also been given an experimental drug that doctors refuse to identify. And he has received supportive care including IV fluids.

Brantly is one of the first two Americans treated for Ebola in Atlanta last month. He and Sacra are close friends from their missionary work.

The 51-year-old Sacra had been working at a hospital in Liberia.