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Influences of antibiotics on L. monocytogenes survival (numbers of CFU) in broth upon incubation at a fixed drug concentration for up to 5 h. Closed diamonds, test antibiotics; open squares, controls (to which no antibiotic was added). Values are given as arithmetic means ± standard deviations (n = 3), but most of the corresponding error bars are smaller than the symbols. The values at the bottom of the panel for gentamicin show the number of CFU recorded at the corresponding times.
