In addition, he said that the surrounding nine countries had been put on "high alert".
Nigeria recorded its first case of Ebola in 2014 after a government official named Patrick Sawyer, who had been infected with the virus from Liberia, collapsed on arrival at the airport in country's biggest city, catching health authorities unaware.
17 people are reported to have died from the latest outbreak in the town since December previous year, according to the country's health ministry.
"It is too early to judge the extent of this outbreak", said Dr Peter Salama, WHO Deputy Director-General for Emergency Preparedness and Response. Despite the remote location, one worrying sign is that the outbreak involves three separate locations that cover about 37 miles.
It was reported that on May 30, 2017, the regulatory and ethics-review boards in the DRC approved the use of an experimental Ebola vaccine to combat the disease.
As of 11 May, 34 Ebola cases have been reported in the area in the past five weeks, including 2 confirmed, 18 probable (deceased) and 14 suspected cases.
The organisation has a team on the ground and is preparing to send up to 40 more specialists to the region in the coming week or so. We don't know what causes these species jumps, which makes predicting Ebola outbreaks nearly impossible. The $252 million in cuts proposed by Trump is the amount remaining in that Obama-era package, according to a report in The Atlantic magazine - leaving nothing specifically allocated to deal with any future Ebola epidemic.
The government in DRC declared an outbreak of Ebola hemorrhagic fever, a rare and deadly disease, on Tuesday, according to the World Health Organization. Key partners, skilled in working in Ebola outbreak settings, have been mobilized, such as Doctors Without Borders, the WFP, UNICEF-which helps with communication and sanitation activities-and the International Federation of Red Cross and Red Crescent Societies, which helps perform safe burials. They will also receive a leaflet with information about Ebola and contact numbers of the surveillance officers. The virus is transmitted to human through contact with wild animals and can then be passed from person to person.
"Public health emergency of worldwide concern" means an extraordinary event which is determined, as provided in these Regulations: "(i) to constitute a public health risk to other States through the global spread of disease and (ii) to potentially require a coordinated worldwide response".