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Chitinase activity of the four L. monocytogenes EGDe isolates. Chitinolytic activity assessed using LB agar containing 2% (wt/vol) chitin. Incubation was at 30°C for 120 h. The genotypes of the strains tested are as follows: 1 and 3, 1031 ΔsigB; 2 and 4, 1031 ΔrsbU; 5, WT1031; 6, WT1030; 7, WT1032; 8, WT1033. The 1031 ΔsigB and 1031 ΔrsbU strains were used as controls.
