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.

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Confirmation of Ebola Sudan in Uganda poses a high risk of further spread owing to the index patient's movements across multiple districts and healthcare facilities, the WHO said. It added that rapid containment is critical, because of Kampala's dense population and Mbale's location near the border with Kenya.

Uganda has kicked off a clinical trial of a vaccine against Ebola that killed one person in the outbreak declared last week. Health workers and other people exposed to the strain are being targeted in the trial which began four days after Uganda announced the death of a nurse in the capital, Kampala.

World Health Organization Director-General Tedros Adhanom Ghebreyesus said he was releasing an additional $2 million to support Uganda's response to its Ebola outbreak, which has killed one person and infected at least eight others.

The Trump administration's foreign aid freeze is happening as a deadly Ebola outbreak spreads in Uganda. Some U.S. health officials are concerned that the situation will only worsen with USAID in limbo.

General, said the funding will enhance surveillance, laboratory work, logistics, and infection control efforts across hospitals, treatment centres, and research initiatives in the country. “To further support Uganda‘s response to the Ebola outbreak,