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Virulence of the fliC and fliD interruption mutants in the hamster CDI model. Cumulative results from 2 independent experiments plotting the survival of clindamycin-treated hamsters infected with 103 C. difficile spores. Statistically significant differences (**) from hamsters infected with the wild-type 630Δerm strain were determined using the log rank test (P < 0.01).
