Health care workers are at particular risk of contracting Ebola. Late Thursday, a doctor in New York who had been working in Guinea was found to be infected with Ebola.
The 33-year-old doctor, identified in US media as Craig Spencer, arrived back in America’s largest city at JFK airport on October 17.
He had been travelling from Guinea via Europe, after working with Ebola patients in West Africa for the charity Doctors Without Borders.
A total of nine people with Ebola have been cared for in the United States. Only the Liberian patient has died of the virus here.
Meanwhile, the West African nation of Mali announced its first case of Ebola, in a two-year-old girl who had recently been in Guinea.
Most of the nearly 10,000 Ebola infections so far this year have been in Liberia, Guinea and Sierra Leone, according to the World Health Organization.
There is no drug on the market to treat Ebola, and no approved vaccine to prevent it the often deadly virus that first emerged in 1976.
The WHO said that Ebola vaccine trials could start in West Africa in December, with hundreds of thousands of doses potentially being rolled out by mid-2015.
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