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Figure 7. Passive antibody protection of mice against commercial toxin A product (A) or C. difficile concentrated culture filtrates (B and C). The filtrate was incubated with various rabbit immune sera and prebleed sera, as indicated. *Indicates p < 0.05; **indicates p < 0.01, when compared with the group inoculated with pre-bleed. See “Materials and Methods” section for study group designs.
