The world has never seen an outbreak of the Ebola virus like the one it is currently experiencing, according to the director of the US Centers for Disease Control.
Speaking at a news conference in the Liberian capital Monrovia, Dr Tom Frieden said: "There is need for urgent action. The world has never seen an outbreak of Ebola like this..... I wish I didn't have to say this, but it is going to get worse, before it gets better."
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.