Table 3.

Effect of 10 μM norepinephrine on adherence of an E. coli O157:H7 85–170 nal^R espA mutant (in log₁₀ CFU/g, mean ± S.E.M.) to distal colonic mucosa

Time interval of mucosal E. coli O157:H7 exposure (min)	Control	Norepinephrinea
30	3.70 ± 0.10	3.82 ± 0.10*
60	3.64 ± 0.08	4.04 ± 0.08*
90	3.89 ± 0.05	4.30 ± 0.05**

n = one pair of tissues from each of 6 pigs/each time point

^aAdded to contraluminal bathing medium

^*P < 0.05 and

^**P < 0.01 vs. norepinephrine-untreated control tissues (paired t test)