Figure 2 Invasion of Caco‐2 epithelial cells by Campylobacter jejuni NCTC 11168 after 2 h. Campylobacter cells were grown in Mueller–Hinton (MH) broth (iron(+)), MH broth treated with chelex (iron(−)), and this medium containing 100 μM norepinephrine, and added to cell monolayers at a multiplicity of infection of 25:1. Results represent the mean plus SD of three separate experiments. *p<0.05.