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Transfer of Escherichia coli antibodies from sow to piglet.

Summary Pregnant sows were immunised either actively by injecting a bacterial extract or a killed bacterial suspension prepared from Escherichia coli serotype O138:K81(B), or passively by injecting antiserum or immunoglobulins prepared against an extract of the same organism. Antibodies to this organism were detected in serum from the colostrum-deprived piglets of these sows by means of bactericidal, passive cutaneous anaphylaxis, haemagglutination, and antiglobulin-haemagglutination tests. The evidence suggests that piglets may be passively sensitised in utero as a result of the transfer of maternal antibody and that factors such as the character of the antibody and its fixation in the tissues may influence its detection in piglet serum. These results are discussed in relation to the role of hypersensitivity in the pathogenesis of E. coli disease in the newborn piglet.