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A fast response team has now been set up to deal with Ebola cases in the US, as Alastair Leithead reports
A major outbreak of Ebola in the US and elsewhere in the West is unlikely given the strong health systems, the World Health Organization (WHO) says.
US President Barack Obama also said the risk of Americans getting the virus was "extremely low", although he ordered a "much more aggressive response".
The US is investigating how a nurse infected when treating a victim in Texas was allowed to travel on a plane.
Officials are trying to trace the 132 people who flew with Amber Vinson.
The disease has killed about 4,500 people so far, mostly in Liberia, Guinea and Sierra Leone.
EU health ministers are meeting in Brussels to discuss the crisis, including increased screening of travellers and the possibility of sending more troops to West Africa to help contain the virus.
Meanwhile, US federal health officials will appear before a congressional committee on Thursday to answer questions about their handling of the crisis.
'Very low'Christopher Dye, WHO director of strategy, said the introduction of Ebola into the US or other countries in Western Europe was a matter "for very serious concern".
"The possibility that once an infection has been introduced that it spreads elsewhere, is something that everybody is going to be concerned about," he said.
But he added: "We're confident that in North America and Western Europe where health systems are very strong, that we're unlikely to see a major outbreak in any of those places."
Earlier, President Obama said the likelihood of a widespread Ebola outbreak was "very, very low".
New US Ebola control measures
- A "site manager" will supervise how workers at the Texas Health Presbyterian Hospital put on and take off protective clothing
- Two nurses from Emory University Hospital in Atlanta will offer "enhanced training" in Dallas
- An immediate response team will travel to the site of any future Ebola diagnoses to hit the ground "within hours"
- New guidelines for testing at hospitals throughout the US, with special emphasis on asking questions about travel history
Could it spread around US?
Confusing death figures
However, he promised a "much more aggressive" monitoring of Ebola cases in the US.
Britain, Canada and the US have introduced increased screening of travellers arriving at airports from West Africa.
France said on Wednesday that it would begin checks from Saturday on passengers arriving at Paris Charles de Gaulle airport from the Guinean capital, Conakry.
Nurse allowed to travelUS health officials are facing new questions about the response to Ebola infections in Texas.
Thomas Eric Duncan was the first person to be diagnosed in the US with Ebola after he flew in from Liberia. He was treated at the Texas Health Presbyterian Hospital but later died.
In testimony prepared for Thursday's congressional hearing, Daniel Varga, the chief clinical officer for Texas Health Resources, apologises for mistakes made in treating Mr Duncan.
"We did not correctly diagnose his symptoms as those of Ebola. We are deeply sorry," he says.
Two nurses, Nina Pham and Amber Vinson, contracted Ebola after treating Mr Duncan.
Both wore face shields, hazardous materials suits and protective footwear as they drew blood and dealt with Mr Duncan's body fluids and it remains unclear how they were infected.
US media reaction
- The New York Times says the appearance of the latest Ebola patient "provided more signs of concern about federal officials' ability to control the spread of the disease... and indications that the issue was becoming politicised"
- A report by USA Today says health officials now believe Ebola patients should be treated at four specially designed US clinics rather than at hospitals around the country
- Ebola is becoming "the next great American panic", writes Chico Harlan in the Washington Post
- The Christian Science Monitor looks at how much large donations, such as the $25m (£16m) given by Facebook chief executive Mark Zuckerberg and his wife, Priscilla Chan, can help fight the spread of the disease
Ms Vinson later contacted the US Centers for Disease Control and Prevention (CDC) to inform it she was travelling on a plane on Monday - Frontier Airlines Flight 1143 from Cleveland to Dallas-Fort Worth.
She reported a temperature of 37.5C (99.5F) and CDC director Thomas Frieden said she should not have travelled on a commercial flight.
However, another health official told the New York Times later that Ms Vinson was not prevented from flying because the temperature was mildly elevated and was in a category not covered by the CDC.
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Farmers in Sierra Leone have deserted their land during the Ebola outbreak
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The BBC's Alastair Leithead on how to wear a bio-hazard suit
"I don't think we actually said she could fly, but they didn't tell her she couldn't fly," the official told the Times. "She called us... I really think this one is on us."
Officials are trying to trace all 132 passengers but insist that as Ms Vinson did not have a fever, the risk to "any around that individual on the plane would have been extremely low".
Ms Vinson has now been transferred to hospital in Atlanta.
In other developments on Thursday:
- An Air France airliner passenger is being given a medical examination after his plane landed in Madrid from Paris
- Sierra Leone says the last district not to have registered any Ebola cases - Koinadugu in the far north - has now reported two infections
- UN High Commissioner for Human Rights Zeid Raad al-Hussein says his agency is drawing up guidelines so that Ebola-hit nations do not violate human rights with quarantine rules
*In all but three cases the patient was infected with Ebola while in West Africa. Infection outside Africa has been restricted to health workers in Madrid and in Dallas. DR Congo has also reported a separate outbreak of an unrelated strain of Ebola.
Continue reading the main storyHow not to catch Ebola:
- Avoid direct contact with sick patients as the virus is spread through contaminated body fluids
- Wear goggles to protect eyes
- Clothing and clinical waste should be incinerated and any medical equipment that needs to be kept should be decontaminated
- People who recover from Ebola should abstain from sex or use condoms for three months
Ebola basics: What you need to know
How Ebola attacks
Ebola: Mapping the outbreak
Continue reading the main storyINTERACTIVE
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The cap forms part of a protective hood covering the head and neck. It offers medical workers an added layer of protection, ensuring that they cannot touch any part of their face whilst in the treatment centre.
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Goggles, or eye visors, are used to provide cover to the eyes, protecting them from splashes. The goggles are sprayed with an anti-fogging solution before being worn.
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Covers the mouth to protect from sprays of blood or body fluids from patients. When wearing a respirator, the medical worker must tear this outer mask to allow the respirator through.
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A respirator is worn to protect the wearer from a patient's coughs. According to guidelines from the medical charity Medecins Sans Frontieres (MSF), the respirator should be put on second, right after donning the overalls.
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A surgical scrub suit, durable hospital clothing that absorbs liquid and is easily cleaned, is worn as a baselayer underneath the overalls. It is normally tucked into rubber boots to ensure no skin is exposed.
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The overalls are placed on top of the scrubs. These suits are similar to hazardous material (hazmat) suits worn in toxic environments. The team member supervising the process should check that the equipment is not damaged.
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A minimum two sets of gloves are required, covering the suit cuff. When putting on the gloves, care must be taken to ensure that no skin is exposed and that they are worn in such a way that any fluid on the sleeve will run off the suit and glove. Medical workers must change gloves between patients, performing thorough hand hygiene before donning a new pair. Heavy duty gloves are used whenever workers need to handle infectious waste.
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A waterproof apron is placed on top of the overalls as a final layer of protective clothing.
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Ebola health workers typically wear rubber boots, with the scrubs tucked into the footwear. If boots are unavailable, workers must wear closed, puncture and fluid-resistant shoes.
Have you been affected by the issues raised in this story? You can share your experience by emailing haveyoursay@bbc.co.uk.
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