The chief of the French-founded group, also known as Médecins Sans Frontières (MSF), Joanne Liu, spent 10 days in the disease-hit regions of West Africa, before voicing her conclusions at a Friday press conference in Geneva.
"[Ebola] is deteriorating faster, and moving faster, than we can respond to," she told reporters.
The deadliest ever outbreak of Ebola has already claimed 1,145 lives, according to official figures, which could in fact "vastly underestimate" the real magnitude of the disaster, the World Health Organization warned a day earlier.
#Ebola: international response to #Ebolaoutbreak dangerously inadequate http://t.co/4Qqd9FaccZ"It is like wartime," Liu said. "It's moving, and advancing, but we have no clue how it's going. Like in wartime, we have a total collapse of infrastructure."
- MSF UK (@MSF_uk) August 15, 2014
She gave as an example a 40-bed treatment center in Liberia, where 137 people are being cared for. Overcrowded facilities there are "absolutely dangerous," Liu said.
Comment: Don't miss Ebola transmission: "Being within 3 feet" or "in same room" can lead to infection.