1. Swarming motility of A. hydrophila strains SSU, ATCC 7966T, E1, and E2.
Swarming motility of A. hydrophila strains SSU, ATCC 7966T, E1, and E2. (A) Strains E1 and E2 had swarming motility comparable to that of strain SSU on Difco nutrient agar plates with 0.5% Eiken agar at 30°C when the bacteria were propagated as described previously (19). (B) By an alternative protocol, strains were subcultured from the freezer onto blood agar plates and then inoculated onto swarming plates. In this assay, strain E1 had swarming motility superior to that of strain SSU, and strain E2 exhibited no swarming motility. Three independent experiments were performed, and the arithmetic means ± the standard deviations were plotted. An asterisk indicates a P value of <0.001 as determined by one-way ANOVA.
Christopher J. Grim et al. mBio 2013; doi: /mBio