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

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.

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.

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 number of confirmed Ebola cases in Uganda has risen to nine from three, the country's health ministry said.

Nine people were confirmed to have Ebola virus in Uganda and around 265 others are being monitored under quarantine, health authorities have said. The nine include the first victim, a male nurse who died the day before the outbreak was declared on January 30.