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OD540 values of 0.427 ± 0.179, 0.159 ± 0.032, 0.313 ± 0.258, and 0.49 ± 0.164 were obtained for s1/i1/m2-VacA, s1/i2/m2-type VacA, s1/i3/m2-type VacA, and s1/i1/m1-type VacA, respectively (mean ± SE). The OD540 value of H. pylori ATCC49503 (the positive control) was 0.67. The asterisks indicate significant differences (p<0.05) according to the Tukey-Kramer test. n.s.: not significant
