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In this model, PA infected cholesteatomas enlarge more rapidly and are more destructive than uninfected controls. OPPA8, the strain from a human cholesteatoma, showed the greatest enlargement and bone destruction. Additionally, we demonstrate that TFP is a virulence factor in this model because the nonpiliated isogenic mutant, OPPA8-NP, was significantly less aggressive than the wild-type OPPA8 indicating that type IV pili may be a virulence factor in this disease.
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Jung et al. (2011) studied this question.
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