Health officials hope they can use it to contain the latest outbreak in Democratic Republic of Congo, which the WHO believes has so far killed 20 people since April.
"One new case of Ebola virus disease has been confirmed in Wangata, one of the three health zones of Mbandaka, a city of almost 1.2 million people in Equateur Province in northwestern Democratic Republic of the Congo", the UN's health agency said in a statement.
She says health experts have identified 500 contacts who are now being traced.
"We will intensify the monitoring and tracing of the population to all air, sea and road access routes".
The World Health Organisation has sent 5,400 doses of an experimental Ebola vaccine to Congo, with thousands more to be shipped in the coming days.
Ebola is most feared for the internal and external bleeding it can cause in victims owing to damage done to blood vessels. "So it means this first shipment would be probably enough for around 25-26 rings - each around one confirmed case".
Till now, Congo has reported 23 deaths among the 42 suspected, probable and confirmed cases. Vaccine for curing Ebola has not been discovered yet.
The worst-ever Ebola outbreak started in December 2013 in southern Guinea before spreading to neighbouring west African countries Liberia and Sierra Leone, killing more than 11,300 people out of almost 29,000 registered cases. As per Associate Press, Congo's health minister has confirmed that Ebola has spread to the capital of Equateur province. He said another 4,000-vaccine batch was expected soon. According to Ilunga, one sample proved positive for the deadly Ebola virus, bringing to three the number of confirmed Ebola cases in three health zones. The health body also sent 300 body bags for safe burials in affected communities.