Dr. Peter Stafford was working at a Christian hospital near the center of the outbreak that has killed at least 131.

A small number of U.S. citizens have been directly affected by the outbreak in the Democratic Republic of Congo and Uganda, the C.D.C. said on Sunday.

Leaders of the Christian missionary group Serge, where Dr. Peter Stafford works, said he had unknowingly operated on a patient with Ebola before the outbreak was detected.

The death toll is rising in the Congo and Uganda following an Ebola outbreak. Among those, who have tested positive for the virus, is an American doctor. (AP photo)

Congo's health minister has announced the opening of three treatment centers for Ebola virus in the eastern Ituri region

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