Analysis of the Caco-2 transcriptional response to infection by S. Enteritidis motile or paralyzed isolates. Polarized Caco-2 cells were infected with isolate 251/01 or 8/02, and at 3 h postinfection, the levels of mRNA transcripts for CCL20 (A) or IL8 (B) were measured by qRT-PCR. Values were normalized with values of 18S RNA and referenced to values of uninfected cells. Fla−, a Salmonella isolate lacking flagella; ns, not statistically significant (P > 0.05); *, P < 0.05; **, P < 0.01; ***, P < 0.001.