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C. difficile CD1342 (open circles), M68 (closed squares) or BI-7 (closed triangles) at either 1-, 3- & 11-d.p.c (A) or if the hamsters succumbed to infection (B). Toxin was quantified using a cell-based assay by serially diluting filtered caecal content obtained at post-mortem. Symbols represent mean toxin levels.
