Table 1.

Invasion capacity of wild-type C. jejuni 81-176 Sm^R and mutant strains for T84 colonic cells.

Strain	Invasion of T84 cells (% inoculum)^a
Wild-type	2.23 ± 0.28
Δ σ ²⁸	0.16 ± 0.06^*
Δ 0996	0.20 ± 0.05^*
Δ fspA1	2.59 ± 0.15
Δ fedA	0.22 ± 0.05^*
Δ fedB	1.80 ± 0.34
Δ fedC	2.17 ± 0.38
Δ fedD	1.61 ± 0.30
Δ ciaI	1.11 ± 0.35^*

Percent invasion was determined by comparing the number of intracellular bacteria surviving a 2 h gentamicin treatment of infected T84 cells compared to the number of bacteria in the infecting inoculum (approximately 3.0 × 10⁶ cfu). Each assay was performed in triplicate, and at least three biological replicates were performed. The average percent invasion +/- standard error for each strain is presented. Statistically-significant differences in invasion between wild-type C. jejuni and mutant strains are indicated

P-value < 0.05.