According to UN officials the Balkans may be the gateway for bird flu in Europe:
Millions of birds migrate each year to Black Sea neighbours Romania and Bulgaria for the milder winter climate, making the area a potential gateway to central Europe for the bird flu virus, which has already swept into Russia from southeast Asia.
[...] "Knowing the flyways and the bird species that use them, there is a high likelihood that the virus will continue to spread as it has so far," Jutzi, Director of the Animal and Production and Health Division of the U.N.'s Food and Agriculture Organisation, told Reuters.
"Particularly in the southeastern part of the Balkans, given that these flyways go down there ... It is quite probable in the future and is a major concern for us."