Nebraska Medicine said an American health care provider will be observed and possibly treated in the hospitals biocontainment unit.

The health care provider, an American, was working in Sierra Leone and experienced a high-risk exposure to the Ebola virus, according to a news release.

This patient has been exposed to the virus but is not ill and is not contagious, Dr. Phil Smith, medical director of the biocontainment unit at Nebraska Medicine, said in the release. However, we will be taking all appropriate precautions. This patient will be under observation in the same room used for treatment of the first three patients and will be carefully monitored to see if Ebola disease develops.

Three Ebola patients have been treated at Nebraska Medicine, according to the release.

Smith said biocontainment unit staff will observe the patient for "development of infection during the 21-day incubation period of the disease, both by monitoring for symptoms and through blood tests."

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Nebraska Medicine to observe, possibly treat health care provider exposed to Ebola