Introduction:Serratia marcescens is a gram-negative pathogen of many species. Its pathogenicity and survival are linked to its capacity build biofilms as well strong inherent resistance antimicrobials cleaning agents. Objectives: To analyse the impact glyceryl trinitrate (GTN) on gene expression QS-related genes (rssB, rsmA,and pigP) S. marcescens. Methodology: The broth microdilution technique...