There are plans to cull 4,000 birds. The cases were found at farms around the village of Brudzen near the city of Plock, Poland's chief veterinary officer Ewa Lech said on television.

The outbreak, announced by U.S. and Ugandan health officials on Thursday, is in Bundibugyo, near the border with Democratic Republic of Congo.

Tunisia's president, Zine El Abidine Ben Ali, inaugurated a national gene bank this month (11 November) to promote the development of sustainable agriculture in the country.

Located in Tunis, the National Gene Bank aims to preserve biological diversity and protect genetic resources, boost scientific research in agricultural biotechnology and promote sustainable genetic diversity for research into plant breeding and crop improvement.