The mayor said a state lab in Athens confirmed Monday afternoon that one of the nine samples proved positive for an H5-type virus.
The Romanian government confirmed Saturday that the H5N1 strain of avian influenza had been confirmed in Romania, the first instance of the lethal strain known to have reached Europe.
A statement posted on the government Web site said the strain had been confirmed. Its existence in Romania bolsters the theory that the virus may be spread by migratory birds.
On Thursday, the European Union said the H5N1 strain had been confirmed in Turkish poultry, and said the virus "is H5N1 closely related to a virus detected in a wild bird in central Asia a few months ago."
The EU said then that the strain likely would be found in Romania, and the European Commission said it would ban imports of live birds, poultry meat and other products from Romania. Imports of live birds and feathers from Turkey were banned earlier in the week.
Despite the fact that 117 people in Asia have been infected by the strain and 60 have died, H5N1 in its current form does not easily infect humans.
However, officials fear it could mutate into a more easily transmissible strain and result in a global pandemic.