The food safety authority Nébih has detected a highly pathogenic strand of bird flu in Borsod-Abaúj-Zemplén and Bács-Kiskun counties, in north-east and southern Hungary, respectively, the authority said on Monday. The H5N1 strand was identified in a 6,000-head goose farm in Tiszabábolna, where the authorities have already started to cull the animals. Culling will start on Tuesday at a duck farm in Petőfiszállás keeping 7,100 animals, the statement said.