FREETOWN, Sierra Leone (WJZ)– Several Americans being monitored for Ebola could be coming to a Maryland hospital.

At least 10 Americans working in West Africa have been exposed to the deadly disease.

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Four of them arrived at the Nebraska Medical Center in Omaha yesterday.

The six others will be taken to either NIH in Bethesda or Emory Hospital in Atlanta.

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The CDC says so far none of they are not showing any symptoms.

Another American aid worker with Ebola is already receiving treatment at NIH.

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That worker is listed in serious condition.