Surgical Site Infections (SSIs), previously called post operative wound infections, result from bacterial contamination during or after a surgical procedure.Surgical site infections are the third most common hospital associated infection, accounting for 14-16% of all infections in hospitalized patients. Aims and objectives are to establish the pattern of wound infection in terms of aerobic organisms after contaminated and infected surgical procedures. 50 patients having emergency or elective traumatic or nontraumatic abdominal operations who fulfil the criteria of infected and contaminated wounds are included in the study. Patients to be studied were selected in random basis. The incidence of wound infection is 31.57% in contaminated surgical procedures and 29.03% in infected surgical procedure. Operation in emergency set up results in an increased risk of wound infection. Patients with positive intra operative bacteriology runs a higher risk of developing wound infection. The commonest organism isolated from intra operative swab cultures were E. coli followed by Klbsiella in both infected and contaminated procedures. Presence of polymicrobial flora in intraoperative swab culture is associated with higher rate of wound infection.