S3-Guideline Helicobacter pylori and gastroduodenal ulcer disease of the German Society for Digestive and Metabolic Diseases (DGVS) in cooperation with the German Society for Hygiene and Microbiology, Society for Pediatric Gastroenterology and Nutrition e.V., German Society for Rheumatology, AWMF-Registration-no. 021/001

This guideline updates a prior consensus recommendation of the German Society for Digestive and Metabolic Diseases (DGVS) from 1996. It was developed by an interdisciplinary cooperation with representatives of the German Society for Hygiene and Microbiology, the Society for Pediatric Gastroenterology and Nutrition (GPGE), and the German Society for Rheumatology. The guideline is methodologically based on recommendations of the Association of the Scientific Medical Societies in Germany (AWMF) for providing a systematic evidence-based S3 level consensus guideline and has also implemented grading criteria according to the GRADE (Grading of Recommendations Assessment, Development, and Evaluation) process. Clinical applicability of study results as well as specifics for Germany in terms of epidemiology, antibiotic resistance status, diagnostics, and therapy were taken into account.