Introducing cefuroxime into the remedy treatment of Helicobacter pylori, on the one hand, the investigators will observe whether cefuroxime can replace tetracycline like amoxicillin, on the other hand, the investigators will observe whether it can reduce the rate of adverse effects caused by tetracycline and avoid the allergy of penicillin. If the experiment is successful, it will provide an effective and safe second-line treatment for the majority of patients with failed treatment of Helicobacter pylori.
To observe the efficacy of cefuroxime-containing bismuth quadruple regimen in the eradication treatment of Helicobacter pylori, and to evaluate whether it can be used as a remedial treatment for Helicobacter pylori after initial or repeated treatment failure.