TABLE 2.

Swarming motilitya

StrainMaximal expansion (mean ± SD) in agar concn of:
0.45%0.5%0.6%0.7%0.8%
WT42.4 ± 2.545.0 ± 2.529.5 ± 2.38.5 ± 1.78 ± 1.4
ΔmotCD43.2 ± 2.96.3 ± 0.67.3 ± 0.65.7 ± 1.25.3 ± 0.6
ΔmotAB41.3 ± 2.542.9 ± 2.221.9 ± 4.37.5 ± 0.75.5 ± 0.7
ΔmotABΔmotCD4.8 ± 0.57.7 ± 1.26.3 ± 0.65.3 ± 0.65.5 ± 0.7
flgK::Tn56.7 ± 0.66.3 ± 0.66.7 ± 0.65.5 ± 0.75.5 ± 0.7
pilB::Tn542.4 ± 3.145.8 ± 3.225.7 ± 3.5NTNT
  • a Shown is the maximal swarming expansion in M8 medium with different agar concentrations. For the swarming-positive strains, values were determined by measuring (in millimeters) 10 of the longest tentacles per plate (from three plates). For the swarming-negative strains, values were determined by measuring the radius (in millimeters) of the growth at the inoculation point (from three plates). NT, not tested.