Stüger 2 , E. Glocker 1 , M. Kist 1 1 Institute of Medical Microbiology and Hygiene, National Reference Centre for Helicobacter pylori, Freiburg, Deutschland 2 Austrian Agency for Health and Food Safety, Graz, Oesterreich Introduction: Metronidazole is part of the Italian triple therapy, which is a recommended first line scheme for H. pylori eradication.