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Single infection of polarized Caco-2 monolayers by either S. Enteritidis wild-type, ΔSPI-1, or ΔinvG strains or E. coli DH5α at an MOI of 100. Values represent means ± the standard error of the mean of two independent experiments 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.
