FIELD: veterinary medicine; biological engineering. SUBSTANCE: method involves taking animal blood sample, its sedimenting to obtain serum, causing complement binding reaction with common brucellosis antigen obtained from Brucella abortus strain in S-form and with antigen obtained from Brucella abortus strain 82 in RS-form. Antibody titres are determined and compared. If antibody titres revealed with S-form Brucella abortus strain antigens are at least twice as high as those revealed with RS-form Brucella abortus 82 strain antigens, the animals having brucellosis are differentiated from those being vaccinated. EFFECT: enhanced reliability in distinguishing between ill and vaccinated animals. 1 tbl
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