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Bacterial distribution in representative frozen sections of germ-free zebrafish infected at 5 dpf by 24 h of immersion with GFP-expressing listerial strain. Images were taken with the confocal microscope in samples taken at 24 and 48 h post infection (hpi; five fish/strain at each time point). Lm-EGD and Lm-M7 stand for L. monocytogenes strains EGDe and M7 respectively; and Ln, for L. innocua. Same abbreviations are used for the following figures.
