In an update on the epidemic, which is raging through Guinea, Sierra Leone and Liberia and has spread into Nigeria and Senegal, the WHO said there were no signs yet of it slowing.
"The upward epidemic trend continues in the three countries that have widespread and intense transmission - Guinea, Liberia, and Sierra Leone," the United Nations health agency was reported by Reuters as saying.
It added that a surge in Ebola in Liberia is being driven primarily by a continued increase in the number of cases reported in the capital, Monrovia.