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The detection threshold of gastric fluid nested PCR ((b–d) n = 3; (c) n = 5). (a) Mongolian gerbil gas collection; (b) the relationship between CO2 DOB value and 13C-urea concentrations; (c) the relationship between CO2 DOB value and test time; (d) the relationship between CO2 DOB value and H. pylori concentrations; and (e) the relationship between different H. pylori concentrations in Mongolian gerbils and test time with the 13C-urea breath test.
