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Associated Press

OMAHA, Neb. — The Nebraska doctors treating a surgeon who contracted Ebola while working in Sierra Leone say he is in extremely critical condition.

Dr. Martin Salia, who was diagnosed with Ebola on Monday, arrived in Omaha Saturday.

Dr. Phil Smith leads the Nebraska Medical Center's biocontainment unit that has successfully treated two other Ebola patients this fall. Smith said Sunday that Salia is "extremely ill."

The hospital says the 44-year-old Salia might be more ill than the first Ebola patients successfully treated in the United States.

The deadly virus has killed more than 5,000 people in West Africa, mostly in Liberia, Guinea and Sierra Leona. Of the 10 people treated for the disease in the U.S., all but one has recovered.