FIG. 1.

ELISA inhibition with polyclonal antiserum to purified PS/A (A) and PIA (B) adsorbed with various staphylococcal strains. ELISA plates were coated with PS/A (2 μg/well). In all cases, significantly more antibody to PS/A was adsorbed by parental strains or strains carrying the ica locus than by the corresponding isogenic mutants or vector-control recombinant strains (P ≤ 0.005; unpaired t tests). Bars represent means, and error bars represent the standard errors of the means of five separate measurements.