The medical charity Medecins Sans Frontieres-MSF says outbreak of Ebola in West Africa will take about six months to bring under control.
Speaking in Geneva, MSF President Joanne Lui called for strengthened international co-ordination led by the World Health Organization-WHO.
Ms. Lui said that controlling the outbreak in Liberia which has recorded more than 300 deaths was vital to containing the epidemic.
She stated that if they do not stabilize Liberia, they will never stabilize the region.
The epidemic began in Guinea in February and has since spread to Liberia, Sierra Leone and Nigeria.
So far, 1,069 people have died.
Ebola is transmitted by direct contact with the body fluids of a person who is infected.
Initial flu-like symptoms can lead to external haemorrhaging from areas such as eyes and gums, and internal bleeding which can lead to organ failure.