Missionaries and other Americans who have worked with Ebola victims in Africa will be forced to spend three weeks in quarantine when they return to the United States.
Health officials said the move was a precaution against the spread of the deadly viral disease, which has struck Guinea, Sierra Leone and Liberia.
Missionaries from the Christian aid groups SIM USA and Samaritan's Purse have been working to help combat the world's worst outbreak of the disease.
Two of the relief workers contracted the disease and were being cared for at Emory University in Georgia.
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.