The Pourquier CFT Brucellosis Ag is a suspension of Brucella abortus (Weybridge 99 strain) inactivated by heat and phenol. It is calibrated according to the principle defined by the Council Directive 64/432/EEC to give 50% of fixation with a dilution at 1:200 of the second international anti-Brucella abortus serum (OIEISS).