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Table 1 Definitions of abdominal surgical site infections classified according to the Centres for Disease Control and Prevention [9]

From: Postoperative negative-pressure incision therapy following open colorectal surgery (Poniy): study protocol for a randomized controlled trial

Superficial incisional surgical site infections Deep incisional surgical site infectionsa Organ or space surgical site infections
1. Infection occurs within 30 days after the operation, and 1. Infection occurs within 30 days after the operation, and 1. Infection occurs within 30 after the operation, and
2. Infection involves only skin or subcutaneous tissue of the incision, and 2. Infection involves deep soft tissues (e.g., fascial and muscle layers) of the incision, and 2. Infection involves any part of the anatomy (e.g., organs or spaces), other than the incision, which was opened or manipulated during an operation, and
3. At least one of items A to D 3. At least one of items A to D 3. At least one of items A to D
 A. Purulent drainage, with or without laboratory confirmation, from the superficial incision  A. Purulent drainage from the deep incision but not from the organ or space component of the surgical site  A. Purulent drainage from a drain that is placed through a stab woundb into the organ or space
 B. Organisms isolated from an aseptically obtained culture of fluid or tissue from the superficial incision  B. A deep incision spontaneously dehisces or is deliberately opened by a surgeon when the patient has at least one of the following signs or symptoms: fever (>38 °C), localized pain, or tenderness, unless site is culture-negative  B. Organisms isolated from an aseptically obtained culture of fluid or tissue in the organ or space
 C. At least one of the following signs or symptoms of infection: pain or tenderness, localized swelling, redness, or heat and superficial incision is deliberately opened by surgeon, unless incision is culture-negative  C. An abscess or other evidence of infection involving the deep incision is found on direct examination, during reoperation, or by histopathologic or radiological examination  C. An abscess or other evidence of infection involving the organ or space that is found on direct examination, during reoperation, or by histopathologic or radiological examination
 D. Diagnosis of superficial incisional surgical site infections by the surgeon or attending physician  D. Diagnosis of a deep incisional surgical site infection by a surgeon or attending physician  D. Diagnosis of an organ or space surgical site infection by a surgeon or attending physician
  1. aReport infection that involves both superficial and deep incision sites as deep incisional surgical site infection; report organ or space surgical site infection that drains through the incision as deep incisional surgical site infection
  2. bIf the area around a stab wound becomes infected, it is not a surgical site infection; it is considered a skin or soft tissue infection, depending on its depth