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President Obama has said US government experts think there is an "extremely low" chance of an outbreak of Ebola in America.
Speaking at the Centers for Disease Control and Prevention (CDC), Mr Obama said: "I want the American people to know that our experts here at the CDC and across our government agree that the chances of an Ebola outbreak here in the United States are extremely low."
President Obama has issued a stark warning that the spread of the Ebola virus is "spiralling out of control" in a way that could threaten global security.
He said that without rapid action, the number of victims could soon rise from the thousands to "hundreds of thousands".
President Obama has said the world is looking towards his government to help prevent the spread of the Ebola virus.
Speaking at the Centers for Disease Control and Prevention in Atlanta, he said: "The world is looking to us, the United States, and it's a responsibility we embrace."
"We're prepared to take leadership on this, to provide the capabilities that only America has and to mobilise the world in ways only America can do."
A safety trial of an experimental vaccine for the deadly Ebola virus has been tested on 10 volunteers without any "red flags" indicating a negative reaction so far.
Another 10 volunteers will be injected in the coming days as part of the trial, which is taking place in the state of Maryland.
Researchers will determine not only whether the vaccine causes adverse reactions but also whether it triggers the production of antibodies against the deadly virus, which has claimed the lives of over 2,200 people in West Africa.
US President Barack Obama has met Ebola survivor Dr Kent Brantly and his wife Amber at the White House.
Dr. Brantly, an American citizen, contracted the deadly virus while in Liberia doing missionary aid work.
UN aid agency Unicef has launched an appeal to raise $200m to fight the Ebola outbreak in west Africa.
It is part of a broader appeal from governments and other humanitarian groups for almost $1 billion to fight the disease.
Unicef, which is responsible for the welfare of children in emergency situations, estimates that 8.5 million children and people under the age of 20 live in affected areas in Guinea, Sierra Leone and Liberia
Afshan Khan, Unicef's Director of Emergency Programmes, said: “It is closing schools, destroying health systems and threatening the very fabric of communities. This is a crisis of enormous proportions.”
The unprecedented Ebola outbreak in West Africa requires a $1 billion response to keep its spread within the "tens of thousands" of cases, a United Nations officials has said.
More than 2,500 people have now died from Ebola, the World Health Organisation said.
The organisation reported 5,000 cases across west Africa, describing the crisis as "unparalleled in modern times".
The US is set to unveil a major new initiative to slow down the progress of Ebola in West Africa.
While a US general will coordinate the effort, everything will be planned in sync with international aid agencies and local governments.
- 3,000 military personnel to assist with building and training
- $500 million (£308 million) committed
- As many as 500 new health workers to be trained
- 17 treatment centres to be built with 100 beds apiece
- 10,000 sets of personal protective equipment
- 50,000 home health care kits
- 5,000 body bags
US President Barack Obama is due to announce a ramp-up in efforts to fight the Ebola outbreak in West Africa.
The effort is to include 3,000 US military forces being moved to the region. A command centre will be set up in the Liberian capital Monrovia and 17 treatment centres will be built across the region.
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