Fig. 2

Killing activity of surfactin against B. hyodysenteriae. a B. hyodysenteriae were incubated with different concentrations (9.31, 18.63, 37.25, 62.5, 125, 250, 500 μg/ml) of the B. subtilis-derived surfactin for 0.5 and 1 h. b B. hyodysenteriae were incubated with different concentrations (9.31, 18.63, 37.25, 62.5, 125, 250, 500 μg/ml) of the B. licheniformis-fermented product-derived surfactin for 0.5 and 1 h. The error bars represent the mean ± standard deviations from triplicate assays (n = 3). *P < 0.05 comparing data of 0.5 h versus 1 h