Authorities expanded their efforts Thursday to contact passengers who flew on two flights in the last week with a nurse who was stricken with the Ebola virus.
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Amber Joy Vinson, 29, a nurse at Texas Presbyterian Hospital in Dallas who cared earlier this month for the first U.S. patient to die of the virus, flew on two Frontier Airlines flights between Dallas and Cleveland. Two days after she returned to work, she became the third confirmed case of Ebola in the United States.

On Wednesday, the Centers for Disease Control asked the 132 passengers on flight 1143, which flew from Cleveland to Dallas, to contact the agency as a precaution. One day later, the agency said it wanted to contact the passengers on Frontier flight 1142, which flew on Oct. 10.