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Inhibition of B. pertussis binding to HEp-2 cells by recombinant scFv phages. B is a control in which phage particles have been omitted from the reaction mixture. P is the parent phage not surface expressing any ScFv. All phages were standardized to a titer of 3.6 × 1010 phage particles per reaction. Results shown are means ± SD of triplicates. Percentage of nonadherent B. pertussis cells was calculated as follows: (cell count from each reaction/total B. pertussis count) × 100.
