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Abstract
Extract
It has been shown that serum obtained from normal sheep or from sheep immunized with Salmonella typhimurium contains a number of proteins that have antibody activity against Salm. typhimurium (Jonas, Citation1969a, Citationb, Citationc). In addition to the antibody proteins, the involvement of part of the sheep complement (C) system in the reaction of sheep serum with Salm. typhimurium has also been demonstrated (CitationJonas, 1970).