Dispersion of biofilms formed in 96-well microtiter plates by A. pleuropneumoniae parental strain 4074Nalr, LPS core mutant CG3, and capsule mutant 33.2 by DNase I, proteinase K, and dispersin B (DspB). The means ± SDs from 3 independent experiments are shown. Statistical analysis was performed using ANOVA. *, P < 0.05 compared to the control (Ctr).