Food safety authority Nébih on Tuesday said it has detected a highly pathogenic strand of bird flu at a goose farm in Csongrád-Csanád County, in south-eastern Hungary. A 3km protection zone as well as a surveillance zone were established after the virus subtype H5N1 was detected at the farm in Szentes, Nébih said, adding that some 6,000 geese would be culled.