To evaluate bacterial loads in the spleen, liver, and mesenteric lymph nodes (mLNs), samples of the different organs were homogenized, serially diluted in sterile PBS, and seeded onto LB, MacConkey, or Salmonella-Shigella agar. Plates were supplemented with kanamycin (50 μg/ml) when mutant strains TTSS-1 or TTSS-2 were tested.
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