BERLIN (AP) — A scientist who was infected with Ebola while working for the World Health Organization in Sierra Leone began receiving treatment Wednesday in a Hamburg hospital after being flown overnight to Germany.

The man, whose name and condition are being withheld for patient privacy reasons, is being treated at the U.N. agency’s request in city’s University Medical Center Hamburg-Eppendorf, home to the well-known Bernhard-Nocht Clinic for Tropical Medicine.