Influence of RpfF
and CepI on the virulence of B. cenocepacia against C. elegans. (A) Mutants ∆rpfFBc (∆), ∆cepI (●) and ∆rpfFBc∆cepI (○) showed the reduced virulence compared with their parental wild-type strain H111 (□) in slow killing (A) and fast killing (B) assays. OP50 was used as the mock control. The data presented are the mean of triplicate experiments and the error bars represents the standard deviations.