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Examination of sera from a calf experimentally infected with M. bovis by a specific antibody ELISA. Sera were collected on days 0, 6, 15, 21, and 28 p.i. Each serum was examined for antibodies to seven different synthetic oligopeptides representing distinct repetitive amino acid sequences of VspA, VspB, VspE, or VspF. OD, optical density.
