DAKAR, Senegal — West Africa's first-ever Ebola outbreak in humans is now the most deadly and geographically widespread outbreak on record and is threatening to spread, health officials say.
According to the latest figures from the World Health Organization (WHO), there have been more than 635 cases of Ebola across three countries in the region since the outbreak was first declared in southeastern Guinea in March. It has since spread to Liberia and Sierra Leone. At least 399 people have died.
