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. 1988 Jun;26(6):1175–1180. doi: 10.1128/jcm.26.6.1175-1180.1988

Staphylococcus aureus antigens reactive with milk immunoglobulin G of naturally infected dairy cows.

D S Adams 1, J S McDonald 1, D Hancock 1, T C McGuire 1
PMCID: PMC266557  PMID: 3384928

Abstract

A 14- to 26-kilodalton fraction of Staphylococcus aureus exoproteins isolated by molecular sieve chromatography and electroelution from polyacrylamide gels was shown to specifically react with antibodies in milk of naturally infected dairy cows. Silver staining of the antigen preparation electrophoresed in polyacrylamide gels showed the strongest reactivity in the 24- to 26-kilodalton region with lesser staining at lower apparent molecular sizes. An enzyme-linked immunosorbent assay was developed to differentiate infected from uninfected cows for diagnostic purposes. Samples from S. aureus-infected cows reacted in the assay, and samples from uninfected cows did not. There was no correlation between numbers of somatic cells in the samples and reactivity to the antigens. Samples from cows infected with coagulase-negative staphylococci did not react with the antigens. It was found, however, that some samples from uninfected cows that were recently postpartum or producing low amounts of milk contained antibodies which bound the antigens. This was believed to be due to transport from blood to the mammary gland of antibodies which were generated by previous intramammary infections or infections at other sites.

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Selected References

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