# Council Directive of 28 January 1991 on animal health conditions governing intra-Community trade in ovine and caprine animals (91/68/EEC), Annex D: Official contagious epidydimitis (Brucella ovis) test

Extent: E+W+S+N.I.

Complement-fixing test:
The specific antigen used must be approved by the national laboratory and must be standardized against the international standard anti-brucella ovis serum.
The working serum must be standardized with the international standard anti-brucella ovis serum prepared by the Central Veterinary Laboratory, Weybridge, Surrey, United Kingdom.
A serum containing 50 or more International Units per/ml must be regarded as positive.

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Source: https://www.legislation.gov.uk/eudr/1991/68/annex/D (the official version)
Page: https://openlegislation.uk/eu-directive-1991-68/annex-D
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.