Confirmation of Ebola Sudan in Uganda poses a high risk of further spread owing to the index patient's movements across multiple districts and healthcare facilities, the WHO said. It added that rapid containment is critical, because of Kampala's dense population and Mbale's location near the border with Kenya.

Uganda has begun a clinical trial of a vaccine against the Sudan strain of Ebola following an outbreak that has killed one nurse in the east African country.

The World Health Organization's emergencies director on Friday praised the "fastest roll-out" of an Ebola vaccine trial in the midst of an epidemic, as Uganda responded to its latest outbreak.

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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.

Uganda has launched a trial of a vaccine against the Sudan strain of the Ebola virus, following an outbreak in the country with three confirmed cases. The first patient, a 32-year-old male nurse, died last week.

The U.S. Centers for Disease Control and Prevention on Thursday warned doctors and other healthcare workers about an outbreak of Ebola cases in Uganda.