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 initiated a clinical trial on Monday for a vaccine targeting the Sudan strain of Ebola, which has resulted in one fatality since the outbreak was declared last week.

This is a critical achievement toward better pandemic preparedness and saving lives when outbreaks occur,” said Dr. Tedros Adhanom Ghebreyesus, WHO Director-General.