Another Ebola patient headed to the isolation unit at Emory University Hospital in Atlanta

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ATLANTA (CNN) — Another patient with Ebola is heading to the isolation unit at Emory University Hospital in Atlanta, officials said Monday.

An air ambulance will fly the patient from West Africa and is expected to arrive on Tuesday morning, Emory Healthcare said in a statement.

University officials said they could not reveal additional details because of confidentiality restrictions.

The State Department described the patient as a U.S. citizen who contracted the disease in Sierra Leone.

Earlier Monday, the World Health Organization said a doctor working in an Ebola treatment center in Sierra Leone had tested positive. The WHO would not reveal the nationality of the doctor nor tp where he or she was being evacuated.

Last month, two Americans infected with Ebola were flown to Atlanta for treatment at Emory. They were given an experimental drug to fight the deadly disease and were later released from the hospital.

Another American doctor infected with Ebola arrived in Nebraska for treatment last week.