It is unknown whether the experimental treatments given to the US patients suffering from the Ebola virus were helpful or harmful, according to the director of the US Centers for Disease Control and Prevention (CDC).
In testimony to a special congressional hearing, Dr. Thomas Frieden said he was confident, "there will not be a large Ebola outbreak in the US," although he admitted that it was possible the people entering America could bring the virus with them.
He added that the organisation has more than 250 staff members working on the outbreak, but it was unknown whether the experimental treatments given to the US patients suffering from the Ebola virus was helpful or harmful.
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.