FIG. 1.

Susceptibility of L. monocytogenes F2365 to hydrogen peroxide in milk (rectangles) and BHI growth medium (diamonds) by disk diffusion assays. The sensitivity of L. monocytogenes F2365 to hydrogen peroxide was expressed as the diameter (mm) of the inhibition zone. Sterile 6-mm disks were saturated with different amounts of hydrogen peroxide (from 125 μg to 1,000 μg) and applied to BHI agar plates containing L. monocytogenes F2365 from milk and BHI medium. The diameters of zones of inhibition were measured after overnight growth at 37°C. Data presented here are means for four replicates ± standard deviations.