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Effects of antisera to recombinant pilus subunits on adhesion of S. pyogenes SF370 to HaCaT cells. Adhesion is expressed relative to S. pyogenes in the absence of antiserum (100%), using duplicate samples from three independent experiments (n = 6). Asterisks indicate significant differences relative to the no-serum control (***, P < 0.0001). Similar results were obtained in assays with tonsil epithelium.
