Travellers entering the United States whose trips originated in Ebola-stricken Liberia, Sierra Leone or Guinea must fly into one of five airports from tomorrow that have enhanced screening in place.
The US Department of Homeland Security said the restrictions will subject affected travellers to temperature tests among other protocols.
The five airports are: New York's JFK, New Jersey's Newark, Washington Dulles, Atlanta and Chicago's O'Hare international airports.
These airports account for about 94% of the passengers flying to the US from the Ebola-hit nations.
The restrictions apply to all travellers, including US citizens and those who would have arrived by land or sea.
Elsewhere, a Spanish nurse has been cured of the deadly Ebola virus according to definitive test results.
Teresa Romero, 44, became the first person to contract the virus outside west Africa.
"The criteria set by the World Health Organisation for curing the Ebola virus have been fulfilled ... She is now cured," Doctor Jose Ramon Arribas, head of the Carlos III hospital's infectious diseases unit, told a news conference.
Meanwhile, an aid worker with the International Medical Corps in Liberia has said that the Ebola situation in the region is definitely not under control.
Speaking on RTÉ's Six One News, Seán Casey, who has just returned from the country, appealed for more health personnel and continued financial resources.
Despite the response being scaled up, he said: "We're still not where we need to be."
Mr Casey runs an Ebola treatment unit funded by the Irish Government in Liberia.
He said the centre he runs has been open for a month and has treated over 120 patients. He added that 40% of confirmed cases have died.
Mr Casey described the international community's initial response as "too little too late" and said that he expects an IMC presence in the region for, at least, a further six months.
The largest outbreak of Ebola in history has killed more than 4,500 people since the beginning of the year, with most of the deaths in west Africa.
The World Health Organisation has said its emergency committee on Ebola will meet tomorrow to review the scope of the outbreak and whether additional measures are needed.
WHO spokeswoman Fadela Chaib said: "This is the third time this committee will meet since August to evaluate the situation.
"Much has happened, there have been cases in Spain and the United States, while Senegal and Nigeria have been removed from the list of countries affected by Ebola."
The 20 independent experts, who declared that the outbreak in west Africa constituted an international public health emergency on 8 August, can recommend travel and trade restrictions.
The committee has already recommended exit screening of passengers from Guinea, Liberia and Sierra Leone.
The Irish Association for Emergency Medicine has said that it has serious safety concerns about the threat of Ebola in Ireland.
It said overcrowding in hospital emergency departments, insufficient isolation facilities and the HSE's dependence on locum staff lacking specific training are causes for concern.
In a statement this morning, the association said it was not reassured by HSE and Department of Health claims of full preparedness because of current crowding in emergency departments, particularly in hospitals serving the main airports.
These include Beaumont Hospital in Dublin, University Hospital Limerick and Cork University Hospital.
The association represents consultants in emergency departments.
