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

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.

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

A Ugandan doctor prepares to vaccinate the contact of a patient who had tested positive, during the launch of the vaccination for the Sudan strain of Ebola virus with a trial vaccine at the Mulago Guest House (Isolation centre) in Kampala,

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