Bird flu has been detected in a wild goose in Brandenburg, Reuters reported, citing the eastern German state's farming ministry on Friday. Poultry farmers are being urged to strictly adhere to biosecurity measures.
The infected goose was found in the state's Oder-Spree district, the ministry added.
Highly pathogenic avian influenza has led to the culling of hundreds of millions of farmed birds in recent years, disrupting food supplies and increasing prices. Human cases remain rare.
Outbreaks typically peak in autumn as migratory birds head south.