Fig. 3

Growth inhibitory zone of surfactin against B. hyodysenteriae using agar-well diffusion assay. B. hyodysenteriae were grown in the different concentrations (50, 100, 250, 500 μg/ml) of surfactin produced from B. subtilis (left) and B. licheniformis-fermented products (right) for 24 h. The black arrow indicates inhibition zone. Three experiments were conducted, and one representative result is presented