Already one man with dual US-Liberian citizenship has died from Ebola, after becoming sick on a plane from Monrovia to Lagos and exposing as many as seven other people in Nigeria.
More suspected cases of Ebola moving across borders via air travel are expected, as West Africa faces the largest outbreak of the hemorrhagic virus in history, said Tom Frieden, the head of the US Centres for Disease Control and Prevention.
"It is certainly possible that we could have ill people in the US who develop Ebola after having been exposed elsewhere," Frieden told a hearing of the House Subcommittee on Africa, Global Health, Global Human Rights and International Organisations.
"But we are confident that there will not be a large Ebola outbreak in the US."
Frieden also told lawmakers that people with symptoms of the disease would inevitably spread worldwide, and indeed numerous countries have already begun testing patients with fever and gastrointestinal distress who have recently travelled to West Africa.
However, a CDC spokesman later clarified that Frieden was not saying the United States was bound to get Ebola cases.
"It is inevitable that people are going to show up with symptoms. It is possible that some of them are going to have Ebola," said CDC spokesman Tom Skinner.
There is no treatment or vaccine for Ebola, but it can be contained if patients are swiftly isolated and adequate protective measures are used, Frieden said.
Ken Isaacs, vice president of program and government relations at the Christian aid group Samaritan's Purse warned that the world is woefully ill-equipped to handle the spread of Ebola.
"It is clear that the disease is uncontained and it is out of control in West Africa," he told the hearing.
"The international response to the disease has been a failure."
Samaritan's Purse arranged the medical evacuation of US doctor Kent Brantly and days later, missionary Nancy Writebol, from Monrovia to a sophisticated Atlanta hospital.
