A South Korean duck farm has reported a suspected case of bird flu, the agriculture ministry said Wednesday.
A quarantine zone has been declared around a farm in Cheonan, about 90 kilometres (54 miles) south of Seoul, where ducks showed symptoms of avian influenza, the ministry said.
Health officials are testing samples from ducks at the farm, it said.
In August 2008, South Korea declared itself free of bird flu after the country suffered its worst outbreak of the disease with nearly 8.5 million birds culled.
Three confirmed cases of bird flu from wild migratory birds have been reported this year.