NEW YORK (AP) — When two U.S. aid workers sick with Ebola arrive in Atlanta from Africa, they will be whisked into one of the most sophisticated hospital isolation units in the country.

One of the Americans is due to arrive at the unit at Emory University Hospital on Saturday. The second is expected to arrive a few days later for treatment.

Both worked in a Liberian hospital that treated Ebola patients until they too were diagnosed with the disease.

It will be the first time anyone infected with Ebola is brought into the country. U.S. officials are confident they can be treated without putting the public in any danger.

Liberia is one of the three West Africa countries coping with the largest Ebola outbreak in history.