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Formaldehyde must not be used.
Antigens may be delivered in the concentrated state provided the dilution factor to be used is indicated on the bottle label.
EDTA may be added to the antigen suspension to 5 mM final test dilution to reduce the level of false positives to the serum agglutination test. Subsequently the pH of 7.2 must be readjusted in the antigen suspension.
It may also be advisable to compare the reactivity of new and previously standardised batches of antigen using a panel of defined sera.
At least three dilutions must be prepared for each serum. Dilutions of suspect serum must be made in such a way that reading of the reaction at the positivity limit is made in the median tube (or well for the microplate method).
The degree of Brucella agglutination in a serum must be expressed in IU per ml.
A serum containing 30 or more IU per ml is considered to be positive.] ] ]
Textual Amendments
F1 Substituted by Council Directive 97/12/EC of 17 March 1997 amending and updating Directive 64/432/EEC on health problems affecting intra-Community trade in bovine animals and swine.
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