Health authorities are attempting to track down 132 people who took a US domestic flight with a woman infected with Ebola.

The infected health care worker was a passenger on the flight just one day prior to her diagnosis

The US Centres for Disease Control (CDC) said on Wednesday that the woman “exhibited no signs or symptoms of illness while on flight 1143, according to the crew”.

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Nevertheless, the agency is attempting to track down the passengers to see if they are at risk of infection.

“Because of the proximity in time between the evening flight and first report of illness the following morning, CDC is reaching out to passengers who flew on Frontier Airlines flight 1143 Cleveland to Dallas/Fort Worth October 13,” the CDC said in a statement.

Ebola is transmitted by close contact with the bodily fluids of an infected person.

It is not contagious until a patient begins to show symptoms such as fever, aches, vomiting or diarrhoea.

The second case of US transmission of Ebola was announced by Dallas officials on Wednesday, and follows the diagnosis on Sunday of nurse Nina Pham.

Both health care workers were infected while caring for a Liberian man, Thomas Eric Duncan, who was infected in West Africa and diagnosed in Texas where he had flown to visit family.

– with AAP