The US has announced an expansion of ebola testing at airports, as the first person to be diagnosed in the country has died.
A suspected patient was rushed to hospital in Texas - a sheriff's deputy who entered the Dallas apartment of victim Thomas Eric Duncan, apparently without wearing protective clothing.
He was taken to an urgent care clinic in Frisco, a northern suburb of Dallas, and although he was not among 48 people being monitored closely, he was exhibiting enough symptoms of ebola to trigger a preliminary screening, Fire Chief Mark Piland said.
Pictures from Dallas showed the patient being helped from an ambulance by medics after he was transferred to the Texas Health Presbyterian Hospital, where Mr Duncan died on Wednesday morning.
Frisco's Mayor Maher Maso said the risk to the patient was considered to be "minimal", but officials were proceeding "with an abundance of caution".
From Saturday, the new checks at five major US airports will include taking the temperatures of hundreds of travellers arriving from West Africa.
An estimated 150 people per day will be checked with thermometers that do not need to touch the skin at New York's JFK, Newark in New Jersey, Washington Dulles, Chicago and Atlanta airports.
Barack Obama said the measures were "really just belt and suspenders" to support protections already in place.
Border Patrol agents and flight crews already look for people who are ill and notify the Centers for Disease Control and Prevention if necessary.
Speaking to mayors and local officials, the President said he was confident the US could prevent the virus from spreading.
But he warned: "As we saw in Dallas, we don't have a lot of margin for error. If we don't follow protocols and procedures that are put in place, then we're putting folks in our communities at risk."
Delays in diagnosing and treating Mr Duncan, as well as the infection of a nurse who treated an ebola patient in Spain, have raised fears that Western nations may not be able to prevent an outbreak of the disease, which has now killed 3,879, according to the World Health Organisation.
In Australia, a 57-year-old woman is being tested for ebola after returning from Sierra Leone.
Doctors failed to diagnose Liberian Mr Duncan the first time he went to an emergency room with fever and abdominal pain and said he had been in West Africa.
His partner Louise Troh said: "I trust a thorough examination will take place regarding all aspects of his care.
"His suffering is over."
:: Watch Ebola Crisis: A Special Report tonight at 8.30pm on Sky News, featuring exclusive footage from Alex Crawford at the heart of the outbreak in Liberia.
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