GENEVA/MONROVIA: The worst-ever outbreak of Ebola fever has now killed more than 2,400 people and infected twice that number, according to a new toll released on Friday by the World Health Organization.

“As of Sept. 12, we are at 4,784 cases and more than 2,400 deaths,” the head of the UN health agency, Margaret Chan, told a news conference on the spiraling west African health crisis.

“In the three hardest hit countries, the number is moving faster than the capacity to manage them,” she warned, calling for a stronger, faster response from the international community.

The United Nations has vowed its peacekeepers will not abandon Liberia and will “stay the course” despite the Ebola epidemic raging across the west African nation.

The UN mission has been in the country since the end of its civil war in 2003, but has been downsizing gradually from a peak of 15,000 troops and handing security responsibilities back to local police.

In Liberia, Chan said there is not a single bed left to treat Ebola patients.

Chan did not specify if the latest toll included Nigeria, in addition to Liberia, Guinea and Sierra Leone, the three nations at the epicenter of the epidemic.

The WHO’s previous toll on Tuesday reported 2,300 death across the four countries since the start of the year.

Cuba’s health minister announced at a news conference with Chan earlier Friday that it would be sending send 165 doctors and nurses to Sierra Leone for six months to help fight Ebola.