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(NEWSER) – Dr. Rick Sacra, the third American to contract Ebola, landed in Nebraska this morning and will be moved to the Nebraska Medical Center in Omaha for treatment. Experts insist there is no risk to the public, NBC News reports, but a new study in PLOS Currents finds that Ebola could soon make its way inside US borders on its own.

The study looked at global flight patterns and passenger screening and found that the chance of at least one case arriving in the country by Sept. 22 was as high as 18%,NPR reports.

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