Uganda has begun a trial vaccination programme for the strain of Ebola viral infection that is behind Sudan's latest outbreak, according to the World Health Organization (WHO), while the number of confirmed cases has risen to three.

Ugandan officials are preparing to deploy a trial vaccine as part of efforts to stem an outbreak of Ebola in the capital, Kampala

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