H. pylori strains P12 [21], 26695 [22], J99 [23] and G27 [24] were used in this study. Campylobacter jejuni strains used were the invasive strain, 81-176 [25,26] and the less invasive strain, NCTC11168 [27]. H. pylori strains were cultured on Columbia blood agar base containing 7% (v/v) horse defibrinated blood. C. jejuni strains were cultured at 37 °C on Mueller-Hinton (MH) agar. Microaerophilic conditions were generated using CampyGen gas packs (Oxoid).
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