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OMAHA, Neb. (AP) — A doctor who became infected with Ebola while working in Liberia has arrived at a Nebraska hospital for treatment.

Dr. Rick Sacra was driven by ambulance to the Nebraska Medical Center in Omaha after landing a little after 6 a.m. Friday at Offutt Air Force Base just south of Omaha. His ambulance went into a hospital receiving bay and vanished from public view at 6:38 a.m. He will begin treatment in the hospital's 10-bed special isolation unit, the largest of four such units in the U.S.

MORE: Second American doctor with Ebola is USA-bound

Sacra, from the Boston area, went to Liberia even after hearing that two American missionaries had become infected. He served with the North Carolina-based charity SIM. Sacra didn't treat Ebola patients but delivered babies, so it's unclear how he got infected.

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