Test results on the sick people are pending, and a top WHO official said the outbreak response is proceeding rapidly.

Ugandan authorities have begun a clinical trial of a vaccine against the Sudan strain of Ebola that has killed one person in the outbreak declared last week.

Uganda has confirmed an outbreak of the Ebola virus in the capital Kampala with the first confirmed patient dying from it on Wednesday, the health ministry said on Thursday. It is the East African country's ninth outbreak since it recorded its first infection of the viral disease in 2000.