Officials collect chickens for culling to fight an outbreak of avian flu in Kiziksa village, in western Turkey

Greece has confirmed the country's first case of bird flu. Experts there are conducting further tests to determine whether it is the deadly H5N1 strain.

Meanwhile, European Union investigators in Turkey say they see no sign that avian flu there poses a serious threat to humans. The virus has killed 1,800 domestic birds in Turkey. But officials say its incubation period has passed, and is now mainly a veterinary problem.

Bird flu has also broken out in Romania, prompting the slaughter of thousands of domestic birds to try to contain it.

The German state of Bavaria has banned poultry fairs as a precaution.

And Britain is sending experts to China and Vietnam to study Asian efforts, and will report to an international conference in London in December.

Bird flu has killed about 60 people in Asia, mostly farmers in direct contact with infected poultry. Researchers fear the virus could mutate into a strain easily passed from person to person.