International development organisation Plan International says the outbreak of the Ebola virus is a "health crisis with global dimensions".
Dr Unni Krishnan, the body's head of disaster preparedness and response, said: "The arrival of Ebola in the most populous city in Africa is a wake-up call."
Ebola is no longer a regional crisis - it has become a health crisis with global dimensions. The international community needs to act now before it is too late.
The countries battling Ebola are among the poorest in the world and the public health systems across West Africa are fragile. The impacted countries desperately need financial and technical assistance to avoid a catastrophic situation.
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.