The number of cases of Ebola in West Africa have topped 1,300, according to figures from the World Health Organisation (WHO).
Guinea, Liberia, Sierra Leone and Nigeria were the most affected with 57 new deaths in the past four days.
Sierra Leone president Ernest Bai Koroma has announced a series of emergency measures, to initially last 60 to 90 days.
WHO Director General Margaret Chan said: "The scale of the Ebola outbreak, and the persistent threat it poses, requires WHO and Guinea, Liberia and Sierra Leone to take the response to a new level, and this will require increased resources."
As it reaches seven months since the Ebola outbreak started we take a look at the timeline of events leading up to the spread of the virus.
More than 100 British personnel are arriving in Sierra Leone to combat the Ebola outbreak in West Africa. Here's what else the UK is doing.
A man has been filmed helping an Ebola patient onto a plane without wearing any protective equipment.