Whole-genome epidemiology links phage-mediated acquisition of a virulence gene to the clonal expansion of a pandemic <i>Salmonella enterica</i> serovar Typhimurium clone.

The mean size of sopE -positive transmission clusters was greater than of sopE -negative clusters, although this did not reach statistical significance ( Fig. 3c ; Mann–Whitney U test, P value 0.5).

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