OMAHA, Neb. (AP) — The Nebraska doctors treating an American aid worker who contracted the deadly Ebola virus in Africa last month are going to provide an update on his condition.

The Nebraska Medical Center is planning a news conference on Dr. Rick Sacra’s condition at 10:30 a.m. Thursday. Sacra has been in the hospital’s isolation ward since he arrived from Liberia on Sept. 5.

Sacra has improved over the past couple weeks, and doctors said earlier this week he might be well enough to leave the isolation unit soon.

The 51-year-old from Worcester, Massachusetts, contracted Ebola while working at a hospital in Liberia with the North Carolina-based missionary group SIM.

The World Health Organization says the Ebola virus is believed to have killed more than 2,900 people in West Africa.