Amber Joy Vinson, the second nurse in Texas to contract Ebola, told health officials that she had a fever before she boarded a flight from Cleveland to Dallas, but they gave her permission to fly, CNN reported.
The 29-year-old, who had treated the Dallas Ebola patient Thomas Eric Duncan, told the US Centers for Disease Control and Prevention that she had a temperature of 99.5 Fahrenheit (37.5 Celsius) before boarding the flight on October 13 but she was not advised to stay put, a federal source said.
The CDC's temperature threshold is 100.4F and "she was not told not to fly," the source said.
As it reaches seven months since the Ebola outbreak started we take a look at the timeline of events leading up to the spread of the virus.
More than 100 British personnel are arriving in Sierra Leone to combat the Ebola outbreak in West Africa. Here's what else the UK is doing.
A man has been filmed helping an Ebola patient onto a plane without wearing any protective equipment.