International deployments and pledges of help for Africa's Ebola-hit regions have not yet had any impact on the epidemic, a leading medical charity says.
Christopher Stokes of Medecins Sans Frontieres said the disease was still out of control.
The remarks came as UN chief Ban Ki-moon pleaded for funds, as a drive for donations fell short of its target.
The disease has killed about 4,500 people so far, mostly in west Africa.
MSF currently runs about 70% of the 1,000 beds available in treatment facilities across Liberia, Sierra Leone and Guinea, the countries worst affected by the outbreak.
The BBC's Mark Doyle, at the UN Ebola logistics base in Ghana, says it is generally agreed that at least three times that number are needed and that the disease is still out of control.
There have been some high-profile offers of help from the international community, our correspondent says, for example the British army building a field hospital in Sierra Leone.
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Sierra Leone boy: "I've lost five members of my family"
But Mr Stokes told the BBC that these initiatives would not have any significant impact for a month or six weeks.
"We're pleased by the fact that people seem to be realising how difficult this is and the scale of the response needed," he said.
"We're just disappointed with the deployment as it puts in danger our chance of really getting on top of this collectively."
If Mr Stokes is right, and little changes between now and December, our correspondent adds, the world may not have a workable plan to tackle Ebola.
Another NGO, Action Aid, said the outbreak had to be tackled at source in west Africa.
Its head of humanitarian response, Mike Noyes, said in a statement: "There remains an urgent demand in countries like Liberia and Sierra Leone for more doctors, nurses, medical supplies and support for preventative measures.
"It is vital the world increase its efforts in fighting the disease."
Mr Noyes added that the current Ebola outbreak had already claimed three times as many lives as all previous outbreaks.
Growing chorusOn Thursday, UN Secretary-General Ban said a $1bn trust fund he launched in September has received just $100,000 (£62,000) so far.
Mr Ban joins a growing chorus of world leaders criticising the global effort to tackle the Ebola outbreak.
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Kofi Annan says he is "bitterly disappointed" by the international response
Donors have given almost $400m (£250m) to other UN agencies and aid organisations directly but the UN trust fund, intended to act as a flexible spending reserve, has itself only received pledges of just $20m (£12m).
Of those countries that have pledged money to the trust fund, only Colombia has paid, giving $100,000 (£62,000).
Mr Ban said it was time for the countries "who really have capacity" to provide financial and other logistical support.
Similar calls have been made in recent days by US President Barack Obama, UK PM David Cameron, and World Bank President Jim Yong Kim.
Former UN Secretary General Kofi Annan has told the BBC he was "bitterly disappointed" with the international community's response.
"If the crisis had hit some other region it probably would have been handled very differently," he said in an interview with BBC Newsnight.
"In fact when you look at the evolution of the crisis, the international community really woke up when the disease got to America and Europe."
The World Health Organization has said it is "ramping up" efforts to prevent Ebola spreading beyond the three countries most affected.
WHO official Isabelle Nuttall said 15 African countries were being prioritised for help in prevention and protection, with the four countries directly bordering the affected areas - Ivory Coast, Guinea Bissau, Mali and Senegal - getting the most attention.
- Avoid direct contact with sick patients as the virus is spread through contaminated body fluids
- Wear goggles to protect eyes
- Clothing and clinical waste should be incinerated and any medical equipment that needs to be kept should be decontaminated
- People who recover from Ebola should abstain from sex or use condoms for three months
Ebola basics: What you need to know
Continue reading the main storyINTERACTIVE
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The cap forms part of a protective hood covering the head and neck. It offers medical workers an added layer of protection, ensuring that they cannot touch any part of their face whilst in the treatment centre.
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Goggles, or eye visors, are used to provide cover to the eyes, protecting them from splashes. The goggles are sprayed with an anti-fogging solution before being worn.
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Covers the mouth to protect from sprays of blood or body fluids from patients. When wearing a respirator, the medical worker must tear this outer mask to allow the respirator through.
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A respirator is worn to protect the wearer from a patient's coughs. According to guidelines from the medical charity Medecins Sans Frontieres (MSF), the respirator should be put on second, right after donning the overalls.
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A surgical scrub suit, durable hospital clothing that absorbs liquid and is easily cleaned, is worn as a baselayer underneath the overalls. It is normally tucked into rubber boots to ensure no skin is exposed.
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The overalls are placed on top of the scrubs. These suits are similar to hazardous material (hazmat) suits worn in toxic environments. The team member supervising the process should check that the equipment is not damaged.
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A minimum two sets of gloves are required, covering the suit cuff. When putting on the gloves, care must be taken to ensure that no skin is exposed and that they are worn in such a way that any fluid on the sleeve will run off the suit and glove. Medical workers must change gloves between patients, performing thorough hand hygiene before donning a new pair. Heavy duty gloves are used whenever workers need to handle infectious waste.
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A waterproof apron is placed on top of the overalls as a final layer of protective clothing.
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Ebola health workers typically wear rubber boots, with the scrubs tucked into the footwear. If boots are unavailable, workers must wear closed, puncture and fluid-resistant shoes.
Have you been affected by the issues raised in this story? You can share your experience by emailing haveyoursay@bbc.co.uk.
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