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Antibody responses in a 1:10 dilution of serum from mice immunized with one of three different doses of high-molecular-weight O polysaccharide correlated with the percentage of target P. aeruginosa bacteria killed in an opsonophagocytosis assay. Each O.D. value represents IgG reactivity (measured by ELISA) to the LPS antigen expressed by different serogroup O2 target strains.
