Dr Tedros Adhanom Ghebreyesus said it was moving faster than any previous one and had a high risk of spreading to other countries in the region.
READ MOREFear of Ebola is keeping pregnant women away from healthcare facilities in eastern Democratic Republic of Congo, raising the risk of stillbirths, premature births and maternal deaths as the country's deadliest Ebola outbreak continues to disrupt routine medical care.
Responders are warning the deadly haemorrhagic virus is spreading at an unprecedented rate, outpacing efforts to slow it in the remote eastern part of the country.
Gédéon Banga Ngbape said a challenge they are facing with right now is that health workers haven’t been paid in over three months.
The United Nations says more than 500,000 Somalis were displaced during the first three months of this year, with drought responsible for nine out of ten displacements.
Adding to scientists' understanding of the crisis, a new study has found that the outbreak was most likely triggered by a new spillover of the virus from animals to humans, rather than continued transmission from a previous Ebola outbreak.
Two potential treatments are being tested on confirmed Ebola patients in Ituri
This outbreak, caused by the **Bundibugyo virus**, has become the second-largest Ebola outbreak ever recorded and the fastest-spreading in Congo’s history.
The Democratic Republic of Congo has tested and isolated about 200 passengers from a river boat intercepted in Kinshasa after a traveller died of suspected Ebola. Africa CDC says the move is aimed at containing the outbreak as authorities weigh broader vaccination efforts.
UNICEF says the use of essential services has dropped by 42 per cent in the primary outbreak hotspots in the east of the country.
People living in Kinshasa are trying to maintain their daily routines, even as the ebola outbreak is worsening in other parts of the Democratic Republic of Congo.
More health workers went on strike in Bunia in eastern Congo on Wednesday, becoming the latest group to walk off the job over unpaid salaries at the center of the country's Ebola outbreak.
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