(CNN) -- The first person to be diagnosed with Ebola on American soil went to the emergency room last week, but was released from the hospital even though he told staff he had traveled from Liberia. "A travel history was taken, but it wasn't communicated to the people who were making the decision. ... It was a mistake. They dropped the ball," said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases. "You don't want to pile on them, but hopefully this will never happen again. ... The CDC has been vigorously emphasizing the need for a travel history," Fauci told CNN's "The Lead with Jake Tapper."
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NEW: U.S. official to CNN: The situation is a "screw-up"
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Dallas mayor: The patient came into contact with up to 20 people
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Hospital says symptoms 'did not warrant admission' last week
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NIH official on hospital: "They dropped the ball"
Another @placeholder doctor working with the same charity was also infected in Liberia and brought home for treatment.