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3. Anon, 1993. General guidance on methods for the detection of Salmonella. ISO 6579 Microbiology, 3rd edn. Genova.
4. Anon, 1998. Trends and sources of zoonotic agents in animals, feedstuffs, food and man in the European Union. European Commission, BgVV, Berlin, Germany.
5. Anon, 1999. Annual Report on Zoonoses in Denmark 1998. Danish Zoonosis Centre, Copenhagen.