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Vero cell cytotoxicity of Shiga toxin-producing E. coli isolates from retail meats. The CD50 is expressed as the toxin dilution that causes 50% Vero cell detachment compared with untreated cells (control). The value on the y axis indicates the log of the reciprocal of the CD50. The data shown are averages for three independent assays. *, strains EDL933 and K-12 served as positive and negative controls, respectively.
