Mice were humanely euthanized by CO2 asphyxiation, and the spleen, liver, ileum, cecum, colon, Peyer’s patches, and MLN were collected. A third of each organ was collected in 3 mL of ice-cold phosphate-buffered saline (PBS), weighed, homogenized, serially diluted in 1× PBS, and plated on Nal plates for enumeration of S. Typhimurium in each organ. Peyer’s patches and MLN were collected whole. The data are expressed as CFU/g of tissue.
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