David Cameron has called for EU leaders to double their funding in the fight against Ebola to £800 million.
It comes after one of the doctors who discovered the virus, Professor Peter Piot, said the rest of Europe was not doing enough to tackle the epidemic.
Downing Street said the current total contribution from the EU was just £400 million.
Cameroon has closed all its borders with Nigeria in a bid to stop the spread of the deadly Ebola virus, according to state radio.
In a statement, government spokesman Issa Tchiroma Bakary said:
The virus has killed more than 1,200 people in four West African countries in the latest outbreak, including four in Nigeria.
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.