He said that in spite of a reported drop in new cases in Liberia, the country hardest hit by Ebola, it was too soon to determine whether this trend will hold.

More than 2,500 US military personnel are in West Africa as part of "Operation United Assistance", helping battle the Ebola outbreak by providing logistical support and training for health care workers, as well as testing fluid samples and building emergency treatment units.

According to the World Health Organisation (WHO), Ebola has killed more than 5,400 people in Liberia, Sierra Leone and Guinea since March.  Ebola is a disease caused by the Ebola virus.

Symptoms of the disease typically start between two days and three weeks after contracting the virus. In the beginning, the symptoms may range from fever, sore throat, muscle pain, and headache. Then, vomiting and diarrhea usually follow, along with decreased function of the liver and kidneys. Some of those affected may also begin to bleed both internally and externally.

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