Health authorities in Uganda say Ebola cases in the country have risen to nine while 265 other people are being monitored under quarantine.

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.

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

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.