United States president Barack Obama has promised more aggressive action to tackle Ebola after a second US health worker became infected with the virus.
It comes as the Australian government faces growing calls to immediately deploy a medical team to the West African countries hardest hit.
A plea for calm amid growing panic over Ebola fears in the United States.
"If we do these protocols properly, if we follow the steps, if we get the information out, then the likelihood of widespread Ebola outbreaks in this country are very, very low."
That was United States president Barack Obama.
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He says the US government is stepping up its Ebola response, with the deployment of rapid-response teams to hospitals that encounter new Ebola cases.
"We want a rapid-response team, a 'SWAT' team essentially, from the CDC to be on ground as quickly as possible, hopefully within 24 hours, so that they are taking the local hospital step-by-step through exactly what needs to be done and making sure that all the protocols are properly observed, that the use of protective equipment is done effectively, the disposal of that protective equipment is done properly. The key thing to understand about this disease is that these protocols work."
The news that 29-year-old Dallas, Texas, nurse Amber Vinson has now tested positive to Ebola came as no surprise to officials.
They have been warning of more cases of Ebola since nurse Nina Pham became the first person to be infected with the virus on US soil last weekend.
Both nurses were among a team of 77 medical staff treating Thomas Duncan, the Liberian Ebola patient who later died.
Officials admit Ms Vinson should never have been allowed to board a plane from the state of Ohio to Texas a day before she reported symptoms.
They have promised the breach will not happen again.
The US Centres for Disease Control says it is now attempting to trace the other 131 passengers onboard the flight, but adds the risk of infection remains low.
The head of the country's National Nurses United, RoseAnn DeMoro, says the repeated breaches of protocol in US hospitals underlines how ill-prepared authorities have been.
She has told the BBC there is a need for full training, adequate resources and properly equipped isolation rooms.
"We've been told a lot of things that have been wrong. We've been lied to, in terms of the preparation in the hospitals. And we know this because the nurses are telling us this, and the nurses are the ones who are caring for the patients. But what happened in Dallas could happen anywhere, and that's precisely the point."
The current outbreak has killed more than 4,000 people and has infected double that number across seven countries.
Doctors treating the first person known to have caught Ebola outside Africa, Spanish nurse Teresa Romero, say they are cautiously optimistic about her condition.
But the growing number of cases has raised questions about the global response to Ebola.
In a video conference, Mr Obama and the leaders of major European powers have agreed to work together to mobilise greater support to fight the virus in West Africa.
That call has been echoed in Australia, where the Abbott Government is facing growing pressure to deploy a medical team to the region.
The Government has so far donated 18 million dollars to efforts to contain the spread of the deadly virus.
But Opposition foreign-affairs spokeswoman Tanya Plibersek has told the ABC money alone is not enough.
"Australia does have the capacity to help. We've got Australian medical-assistance teams, for example, that could be deployed. Other countries have also deployed defence personnel. For example, the United States is sending around 4,000 personnel, and the UK's sending around 750 personnel. And they're able to do things like build temporary hospitals."
Health Minister Peter Dutton says Australians should not panic about the threat of Ebola domestically, saying the risk of transmission is low.
He says immigration staff have interviewed over 700 Australians who have returned from West Africa.
And he says the Government will not be sending Australian medical teams to West Africa without a guarantee of their safety.
"We don't believe, on the advice available to us, that an Australian health worker put into harm's way in West Africa would survive a 30-hour flight back to Australia to be repatriated to receive medical support if they were to contract the virus. I'm not going to put Australian health workers into harm's way without an assurance that we can provide them with the medical asssistance if they contract the virus."
Prime Minister Tony Abbott emphasises the point, saying Australia is doing enough in West Africa and the focus is at home.
"What I'm very reluctant to do, though, is to direct Australian personnel into an Ebola hot spot when we don't have any means of effectively evacuating such personnel back to Australia and we have no commitments from other countries to treat them there either."
