The United Nations has pledged a surge in resources to tackle the growing Ebola crisis in west Africa.
But its officials warned efforts were being hampered as growing numbers of airlines refuse to fly into affected countries.
The news came as an infected British nurse, William Pooley, was being treated in a special unit at the Royal Free Hospital, London.
The UN wants to focus on Sierra Leone where so far 369 people are known to have died from the disease.
Dr Keiji Fukuda, from the World Health Organisation, who is supervising activity in the country, said: “The situation remains challenging here.
“We will do all we can to get ahead of the outbreak, then we can stop it and help the country get back to normal.”
Mr Pooley was praised by senior nurses for his commitment to the care of infected patients.
He had travelled to the country to work in a hospice but volunteered to care for patients affected by the Ebola outbreak.
Royal College of Nursing chief executive Dr Peter Carter said: "William Pooley demonstrated incredible bravery and commitment in volunteering to provide nursing care in Sierra Leone for those with Ebola, and we wish him a speedy recovery.
"The dedication of frontline health care workers like William is essential for containing the spread of this virus. The risks they face are considerable but they are doing the best they can for their patients.”
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