Abstract
Antibody in hyperimmune rabbit antisera specific for Staphylococcus aureus teichoic acid was shown to be associated with the IgM fraction. Treatment of such sera with mercaptoethanol destroyed its activity in passive mouse protection tests, whereas absorption with antirabbit IgG had no effect. Antibody response in normal rabbits immunized by a single or by three daily injections of a killed vaccine of S. aureus was followed by a sensitive passive hemagglutination test. Antibody detected during the "primary" response was completely susceptible to reduction with mercaptoethanol. Most of the antibody detected after a secondary antigenic stimulation at 10 weeks was also susceptible to mercaptoethanol. The antibody titers correlated well with mouse protective activity, and this activity of the serum was also shown to be associated with the IgM fraction.
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