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Swarming ability of the S. enterica ATCC 14028 wild-type (wt) strain harboring the recA-overexpressing plasmid pUA1109. Colony swarming patterns developed on a semisolid (Difco) agar surface in the presence of increasing concentrations of IPTG (0, 5, 10, 20, and 30 μM) after incubation of the cultures for 24 h at 37°C. As a control, the swarming phenotype of the wild-type strain harboring the pUA1108 overexpression vector without the recA gene in the presence of IPTG is also presented.
