By Sky News US Team
The top public health official in the US is being questioned by politicians amid mounting criticism of his agency's ebola response, including why it allowed a nurse with the disease to board a flight.
Only two people are known to have contracted the virus in the US, but a litany of missteps from health officials has raised doubts about whether they can stop a full-blown outbreak.
Thursday's hearing was held as a Connecticut hospital announced it had admitted a Yale researcher, recently returned from Liberia, for "ebola-like" symptoms.
Members of the House Energy and Commerce Committee are to hear from Centers for Disease Control and Prevention (CDC) chief Tom Frieden.
His testimony comes a day after he acknowledged a nurse, Amber Joy Vinson, should never have been allowed to fly on a commercial jet after she was exposed to ebola while caring for a patient.
A CDC official cleared her to board a plane from Cleveland to the Dallas area, even though she had reported a temperature of 99.5 degrees (37.5C), slightly below the 100.4-degree threshold set by the agency.
Frontier Airlines chief executive David Siegel said in a letter to staff the airline had been told by the CDC that Miss Vinson "may have been symptomatic ... while onboard the flight", reports NBC News.
The health agency is now trying to track down 132 other passengers who were on the plane in case they too have been infected, news that sent airline stocks nose-diving on Wednesday.
Miss Vinson, 29, was one of several nurses to treat Thomas Eric Duncan, who came down with the virus and died on 8 October after travelling to Texas from Liberia.
She was already being monitored closely because a fellow nurse, Nina Pham, 26, caught ebola after also being involved in Mr Duncan's care.
Miss Pham, who was in good condition, is being transferred to a federal facility in Maryland, a day after Miss Vinson was transported to an isolation unit at Emory University Hospital in Georgia.
Dr Frieden has said health protocol breaches led to the infection of the two nurses. More than 70 other healthcare workers involved in Mr Duncan's care were being monitored.
The CDC director has already admitted his agency should have sent an infection-control team to Texas Health Presbyterian Hospital in Dallas as soon as the first case was diagnosed.
President Barack Obama directed his administration on Wednesday to respond in a "much more aggressive way" to the ebola situation in the US.
For the second day in a row he took the unusual step of cancelling trips away from Washington in order to monitor the disease response from the White House.
US House of Representatives speaker John Boehner and other Republicans turned up the pressure by saying Mr Obama should consider a ban on flights to the US from countries worst affected by the virus.
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