caption: <PERSON> was contagious but didn't know it. He was able to come into the country with limited scrutiny. After the two nurses caring for him at a Dallas hospital got sick, his case prompted the United States to shift gears. U.S. airports that had flights from Ebola-stricken areas started health screenings for travelers in October. Passengers arriving from Liberia, Sierra Leone and Guinea had their temperatures taken, were assessed for signs of illness and questioned about their health history.
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