ABSTRACT
Introduction: Infection is the invasion of the body by thepathogenic micro-organisms with consequent local andsystemic effect. For this, a sufficient number of pathogens mustenter the tissues, overcome the patients' resistance andmultiply. The commonest organisms are staphylococcusaureus and gram-negative intestinal bacilli. Streptococcuspyogenes are not infrequent.Objective: The main purpose of this research is to make acomparative study on causative micro-organisms for postoperative wound infection between first and subsequent casesin routine surgical procedure.Method: Incidence of wound infection between first andsubsequent cases in routine surgical procedure was thesubject matter of this study. In this study 228 cases have beenstudied. Of these cases, 76 were the 1st case, 76 were 2ndcase, and 76 were the 3rd case in 76 routine operation days.The study duration was from September 2015 to August 2016.Result: After numerous information and examinationinvestigation; this study revealed that maximum woundinfection was due to Escherichia Coli.Conclusion: The study concludes that Escherichia coli werethe commonest organism isolated from infected wounds whichis the inhabitant of gastrointestinal and biliary tracts.