A second nurse who had treated a US Ebola patient has been diagnosed with the virus just one day after taking a cross-country flight. Authorities are now tracing contacts with 132 passengers aboard Frontier Airlines Flight 1143.

Texas health worker Amber Vinson took the flight from Cleveland to Dallas-Fort Worth on Monday before reporting symptoms on Tuesday and was immediately isolated at Texas Health Presbyterian Hospital.

Nina Pham, the first nurse to contract Ebola after treating Liberian national Thomas Eric Duncan, remains in a good condition in hospital.

Authorities are continuing to monitor 76 other health workers who could have come in contact with Duncan.

President Barack Obama has postponed a political trip on Thursday in order to hold a high-level meeting about the Ebola outbreak.