Uganda on Monday started the first-ever vaccination trial for the Sudan species of the Ebola virus four days after an outbreak was confirmed, the World Health Organization announced.
It is the sixth time Uganda has been hit by an outbreak of the Ebola Sudan virus, for which there is no approved vaccine.
Of the five other Ebola species, just one has licensed vaccines.
The deadliest Ebola epidemic killed more than 11,300 people in west Africa between 2013 and 2016.
