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Development of an enzyme-linked immunosorbent assay for detecting antibodies in sera of Brucella suis-infected swine.

By C O Thoen, M P Hopkins, A L Armbrust, R D Angus and D E Pietz


An enzyme-linked immunosorbent assay was developed using a heat-killed Brucella suis antigen for detecting antibodies in the sera of swine from which B. suis was isolated. Optimal enzyme-linked immunosorbent assay reactions were obtained using heat-killed B. suis antigen at a concentration comparable to McFarland Standard No. 1. Statistically significant differences were observed in the enzyme-linked immunosorbent assay results of 40 animals from which B. suis was isolated and the results for 48 noninfected swine at serum dilutions of 1:25 and 1:50 (P < 0.0001). The enzyme-linked immunosorbent assay is a rapid reproducible test which can be readily automated that appears to have practical value for screening large numbers of breeding and slaughter swine for brucellosis

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