Multicentre, cross-sectional surveillance of Helicobacter pylori prevalence and antibiotic resistance to clarithromycin and levofloxacin in urban China using the string test coupled with quantitative PCR.

Competing Interests: We declare no competing interests. LW and ZL are co-first authors. CYT, BJM, and BG are co-senior authors. This research was supported by the National Natural Science Foundation of China (82272423 and 82072380), National Key Research and Development Program of China (2023YFC2606200 and 2022YFC0870100), Research Foundation for Advanced Talents of Guangdong Provincial People's Hospital (KJ012021097 and KY012023293), Sanming Project of Medicine in Shenzhen (SZSM201510050), and Guangdong Basic and Applied Basic Research Foundation (2022A1515220023).