The bird flu virus detected at a second bird flu-hit poultry farm in Tanba, Kyoto Prefecture, is of the highly contagious H5N1 strain, the National Institute of Animal Health said Monday.

H5N1 was detected at the first farm in the town, meaning there is a higher possibility that the virus spread from Asada Nosan Funai Farm to the Takada farm.

The Funai farm failed to alert authorities of the bird flu outbreak even after a week's time and after birds died at the farm by the thousands. Local authorities inspected the farm Feb. 27 based on an anonymous tip.