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  • Title: BrucELISA: an enzyme-antibody immunoassay for detection of Brucella abortus antibodies in milk: correlation with the Brucella ring test and with shedding of viable organisms.
    Author: Boraker DK, Stinebring WR, Kunkel JR.
    Journal: J Clin Microbiol; 1981 Oct; 14(4):396-403. PubMed ID: 6793622.
    Abstract:
    An indirect enzyme-antibody immunosorbent assay (BrucELISA) is described for the detection of antibody to Brucella abortus in cow's milk. Three series of milk samples were obtained from an adult-vaccinated dairy herd infected with B. abortus. The BrucELISA system was used as a screening test for individual milks diluted 1:200 (BE 200 test), for undiluted bulk milks, and to determine antibody titer (BrucELISA titration assay). The BrucELISA results correlated highly with positive Brucella ring test reactions and culture positivity, eliminated false-positive Brucella ring test reactions, detected antibody in some samples which were Brucella ring test negative, and distinguished between vaccinated and infected animals. BrucELISA titration assay titers of greater than 1:800 were correlated with shedding, or were prognostic for animals which eventually became shedders. Binding of the enzyme-antibody conjugate to bovine immunoglobulin in the absence of rabbit anti-bovine immunoglobulin occurred with culture-positive or -negative milks showing titers of greater than 1:1,600 (the beta effect); the effect was also of predictive value in identifying eventual shedders. The BrucELISA system is a sensitive, specific, and inexpensive method for screening large numbers of individual or bulk milk samples for the presence of antibody to B. abortus.
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