The WHO has said it is focusing its attention on 15 countries to prevent the spread of Ebola, as the EU announced a review of its entry policies and the disease was reported in the last untouched area of Sierra Leone.
Dr Isabelle Nuttall, the WHO's global director, said on Thursday that cases were doubling every four weeks and that health officials were trying to prevent the disease spreading from Liberia, Sierra Leone and Guinea, the worst-hit nations, to neighbouring countries and those with a strong travel and trade relationship.
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