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The man was critically ill and has been in isolation at Texas Health Presbyterian Hospital since Sunday, federal health officials said, They would not reveal his nationality or age.

Authorities have begun tracking down family, friends and anyone else who may have come in close contact with him and could be at risk for becoming ill. But officials said there are no other suspected cases in Texas.

There was no risk to any fellow airline passengers because the man had no symptoms when he was traveling.

Ebola symptoms are fever, muscle pain, vomiting and bleeding, it can be came to know after 21 days. This disease is not found in any one until symptoms are found, and it takes close contact with bodily fluids to spread.