The US is planning to introduce additional screening methods at airports to fight the spread of Ebola.
Although it has dismissed calls for a complete travel ban from affected countries, it says new protocols are being developed both at source and in the US.
Passengers leaving affected countries already have their temperatures checked, but people do not become infectious until they start displaying symptoms.
US President Barack Obama said the likelihood of an Ebola outbreak in the US is ‘extremely low’, but he added: "We don’t have a lot of margin of error."
Obama unveiled the plans for extra screening nearly a week after a Liberian man became the first case of Ebola diagnosed in the US.
Thomas Eric Duncan, who contracted the disease in Liberia, remains in a critical condition in a hospital in Dallas where he is receiving an experimental drug treatment.
Yesterday, it was confirmed that a Spanish nurse has become the first person known to have contracted the deadly Ebola virus outside West Africa.
Investigations are under way at a hospital in Madrid where the nurse had treated two Spanish missionaries who died of the disease after being flown home from the region.
So far, more than 3,400 people have died from the viral disease in West Africa.
