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Mixed infection of polarized Caco-2 monolayers by S. Enteritidis wild-type and ΔSPI-1 strains or wild-type and ΔinvG strains at a 1:1 ratio with an MOI of 100. Values represent the means of two independent experiments ± the standard error of the mean performed in triplicate. (A) Invasion is expressed as a percentage of the wild-type strain. (B) The change in TER is expressed as a percentage of the initial TER value.
