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.

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.

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

Uganda has confirmed an outbreak of the Ebola virus in the capital Kampala with the first confirmed patient dying from it on Wednesday, the health ministry said on Thursday.

In its last outbreak, more than two years ago, Uganda saw 164 cases and 55 confirmed deaths from Ebola. Uganda announced Thursday that a nurse, 32, had died of Ebola in the capital, Kampala, amid a new outbreak of the deadly virus there — the first in two years.

U.S. health officials are telling Americans to take precautions if they travel to Uganda because of an Ebola outbreak.

U.S. health officials advise Americans traveling to Uganda to take enhanced precautions due to an Ebola outbreak