OMAHA, Neb. (AP) — The Nebraska hospital monitoring five American aid workers who were exposed to Ebola in Sierra Leone says they were all doing well Tuesday.

Nebraska Medical Center spokesman Taylor Wilson says none of the people being monitored in Omaha was displaying symptoms of Ebola of Tuesday.

One person remained in the hospital’s biocontainment unit Tuesday as a precaution. That person developed some symptoms Sunday night, but then improved Monday.

Wilson says that person will leave the isolation unit Thursday if they remain free of symptoms and return to a less restrictive location on the hospital campus where the others are staying.

The aid workers were evacuated from Sierra Leone after one of their colleagues contracted the deadly virus.