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The complement-requiring passive hemolysis test withSalmonella typhimurium lipopolysaccharide-coated sheep erythrocytes is more sensitive for antibodies directed against the lipopolysaccharide than is the passive hemagglutination test. The hemagglutinating and hemolyzing antibodies produced in Swiss mice by hyperimmunization, either with or without Freund's adjuvant, were distributed in both the light and heavy fractions isolated by sucrose density gradient fractionation and gel filtration. IgM fractions, whether tested by hemagglutination or hemolysis, were sensitive to 2-mercaptoethanol (0.15m ). On the other hand, IgG hemolytic antibodies were more sensitive to 2-mercaptoethanol than were IgG hemagglutinating antibodies. The resistance of IgG hemagglutinating activity amounted to about 72 to 95% of the total IgG recovered, whereas the resistant portion of the IgG hemolytic activity was approximately 40 to 53%. It is suggested that, although mercaptoethanol sensitivity is not a definitive test for IgM antibody, its use in connection with the hemagglutination test gives at least an approximation of the IgG antibody, whereas the hemolysis test gives a better approximation of maximal measurable antibody againstSalmonella lipopolysaccharides.

Heterogeneity of Antibody Response toSalmonellaLipopolysaccharide Measured by Passive Hemagglutination and Hemolysis in Mice