The World Health Organisation has temporarily pulled out staff from a laboratory testing for Ebola at Kailahun in eastern Sierra Leone after one of its medical workers there became infected.
"It's a temporary measure to take care of the welfare of our remaining workers," WHO spokesperson Christy Feig told Reuters. "After our assessment, they will return." A WHO spokesman said.
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.