The head of Medicins Sans Frontieres (MSF), Joanne Liu -- fresh from a visit to western Africa -- said in Geneva on Friday that more experts were needed in the hard-hit region.
"It is deteriorating faster, and moving faster, than we can respond to," Liu told reporters. "Like in a war time, we have a total collapse of infrastructure," she added.
Lui said the world community needed to get the "upper hand" over the next six months. While the viral spread had been slowed in Guinea, concerns focused especially on Liberia.
"If we don't stabilize Liberia, we will never stabilize the region," Lui said.
She was critical of the WHO for delaying its public health emergency warning until August 8.
"We need people with a hands-on operational mindset," to combat the outbreak, Liu told the Geneva news briefing.