Authorities have registered an 8th case of bird flu in a dead swan in southern Bohemia, near the Austrian border. Tests have shown the presence of the H5 virus: veterinary measures are the same as in previous cases. The spokesman for the State Veterinary Authority, Josef Duben, has confirmed that a 3-kilometre protection zone and a 10-kilometre observation radius have been marked. All previous cases of bird flu were also uncovered in southern Bohemia. Only one showed so far has shown the presence of the deadly H5N1 strain.