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Correlation of neutralization potencies (EC50) and apparent affinities (K′d) of actoxumab (black circles) and bezlotoxumab (white circles) against TcdA and TcdB, respectively, purified from strains of various ribotypes. R2 = 0.96 for TcdA/actoxumab, and R2 = 0.85 for TcdB/bezlotoxumab.
