SEOUL (Reuters) - South Korea said ducks at a poultry farmtested positive for an antibody to a bird flu virus, Yonhapnews agency reported on Tuesday.

There was no information on which strain of bird flu, atthe farm in Paju, around 24.85 miles north of Seoul, had beenidentified. Results of further testing should be known in abouttwo weeks, a local official told Yonhap news agency.

South Korea's agriculture ministry was unable immediatelyto confirm the Yonhap report.

Last month, agriculture ministry officials said theydiscovered a less virulent strain of bird flu at a poultry farmin the south west of the country.

(Reporting by Kang Shinhye; Editing by Chris Johnson)