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Titre of serum anti-Helicobacter pylori IgG antibodies of Mongolian gerbils inoculated orally with H pylori or without H pylori infection (control). Mean (SEM) values are presented. **p<0.01 compared with control; †††p<0.001 compared with the cagG knockout mutants; ‡‡p<0.01, ‡‡‡p<0.001 compared with the virD4 knockout mutants. AI, arbitrary index.
